how many standard deviations is an outlier

If the garden snail with a speed of 0.03 mph is added to the data set, then cheetah is no longer considered an outlier. However, the interquartile range and standard deviation have the following key difference: The interquartile range (IQR) is not affected by extreme outliers. 3 standard deviations is probably the most common one. Calculate the average and standard deviation and determine if any of the results can be considered an outlier. The standard deviation is calculated as the square root of variance by determining each data points deviation relative to the mean. So, a value of 115 is the 84.1st percentile for this particular normal distribution. {eq}\sigma^{2}={\frac{\sum_{i=1}^{N}(x_{i}-\mu)^2}{N}} {/eq}. A barbershop completes an average of 225 haircuts per week during the year with a standard deviation of 7. An example of data being processed may be a unique identifier stored in a cookie. For this outlier detection method, the mean and standard deviation of the residuals are calculated and compared. Then, we divide every data point by the standard deviation S of the distribution. Dots are plotted above the following: 5, 1; 7, 1; 10, 1; 15, 1; 19, 1; 21, 2; 22, 2; 23, 5; 24, 4; 25, 1. How many standard deviations makes an outlier? Contextual (or Conditional) Outliers. Outliers are extreme values that stand out greatly from the overall pattern of values in a dataset or graph. You sort the values from low to high and scan for extreme values. The range ( range ) is the difference between the maximum and minimum values in the data, and is strongly influenced by the presence of an outlier. How many standard deviations makes an outlier? You find one outlier, 64, in your dataset. Now you know what standard deviations above or below the mean tell us about a particular data point and where it falls within a normal distribution. I'm the go-to guy for math answers. How to Find Outliers | 4 Ways with Examples & Explanation. (3 or z-scores of3) The Empirical Rule is also known as the 68-95-99.7 rule. As is generally the case, the corresponding residuals vs. fits plot accentuates this claim: . Such a data point can be an outlier. But opting out of some of these cookies may affect your browsing experience. Its a tricky procedure because its often impossible to tell the two types apart for sure. An outlier is a data point in a data set that is distant from all other observations. How do I draw the box and whiskers? [citation needed] It is the observation of a plurality of purportedly rare events that increasingly undermines the hypothesis that they are rare, i.e. median is 1000. The median is the value exactly in the middle of your dataset when all values are ordered from low to high. Flag any extreme values that you find. Outlier < Q1 - 1.5(IQR) Outlier < 5 - 1.5(9) Outlier < 5 - 13.5 outlier < - 8.5 There are no lower outliers, since there isn't a number less than -8.5 in the dataset. Any data points that are outside this extra pair of lines are flagged as potential outliers. 2 The Empirical Rule is a statement about normal distributions. The same is true for Q1: it is calculated as the midpoint of all numbers below Q2. A commonly used rule says that a data point is an outlier if it is more than. Then Z has a mean of 0 and a standard deviation of 1 (a standard normal distribution). Some outliers represent true values from natural variation in the population. Useful when you only have the maximum and minimum values of a data set. Its important to select appropriate statistical tests or measures when you have a skewed distribution or many outliers. The upper fence is the boundary around the third quartile. 1 How many standard deviations makes an outlier? 1 How many standard deviations is considered an outlier? Both metrics measure the spread of values in a dataset. One of the most commonly used tools in determining outliers is the Z-score. Check out, IQR, or interquartile range, is the difference between Q3 and Q1. Cloudflare Ray ID: 7a140fcb29c6bb47 I have a point which seems to be the outlier in my scatter plot graph since it is nowhere near to other points. 3.) learn more about data literacy in my article here. The cost $2.400 is 0.57 standard deviations the mean, therefore it is . As you can see, having outliers often has a significant effect on your mean and standard deviation. It's also important to note that, for data sets that are "bell-shaped" (normally distributed), about 95% of the data observations fall within 2 standard deviations of the mean. Variance uses squaring that can create outliers, and to overcome this drawback, we use standard deviation. This corresponds to a z-score of -3.0. So, knowing how to find outliers in a dataset will help you better understand your data. The median value will have 5 values on one side and 5 values on the other. Another way we can remove outliers is by calculating upper boundary and lower boundary by taking 3 standard deviation from the mean of the values (assuming the data is Normally/Gaussian distributed). A value that is one standard deviation below the mean gives us the 15.9th percentile. The median value is 31. The 5 is , Posted 4 years ago. The cookie is used to store the user consent for the cookies in the category "Other. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Answer (1 of 3): Yes absolutely. is approximately a 95% confidence interval when The range in this example is (7.4 - 3.9) to (7.4 + 3.9) or 3.5 to 11.3. Well walk you through the popular IQR method for identifying outliers using a step-by-step example. . Calculate the mean of your data, \bar {x} x. 3 How do you use standard deviation to remove outliers? About 99.7% of the area under the curve falls within three standard deviations. How many standard deviations is considered an outlier? Here's a box and whisker plot of the same distribution that, Notice how the outliers are shown as dots, and the whisker had to change. Three standard deviations from the mean is a common cut-off in practice for identifying outliers in a Gaussian or Gaussian-like distribution. Step 2: Calculate the IQR , which is the third quartile minus the first quartile, or . In the bonus learning, how do the extra dots represent outliers? Copyright 2023 Wisdom-Advices | All rights reserved. As the week before the holiday falls outside the calculated range, that week can be considered an outlier. From the rules for normally distributed data for a daily event: On this Wikipedia the language links are at the top of the page across from the article title. Your outliers are any values greater than your upper fence or less than your lower fence. Statistical outlier detection involves applying statistical tests or procedures to identify extreme values. Analytical cookies are used to understand how visitors interact with the website. A value that falls outside of 3 standard deviations is part of the distribution, but it is an unlikely or rare event at approximately 1 in 370 samples. Your main options are retaining or removing them from your dataset. For a data point that is one standard deviation below the mean, we get a value of X = M S (the mean of M minus the standard deviation of S). Also known as outlier detection, it's an important step in data analysis, as it removes erroneous or inaccurate observations which might otherwise skew conclusions. Your dataset has 11 values. There aren't any values higher than 55 so this dataset doesn't have any outliers. This corresponds to a z-score of -1.0. Mean is like finding a point that is closest to all. Causes. You can learn about how to use Excel to calculate standard deviation in this article. Analytical cookies are used to understand how visitors interact with the website. 2.2.7 - The Empirical Rule. The cookies is used to store the user consent for the cookies in the category "Necessary". What is the equation to determine an outlier? How much was the mean affected by the inclusion of the outlier? You can make a tax-deductible donation here. Greater than the mean It does not store any personal data. 4.) The distribution below shows the scores on a driver's test for. Therefore, using the criterion of 3 standard deviations to be conservative, we could remove the values between 856.27 and 1116.52. Step 2: Determine if any results are greater than +/- 3 times the standard deviation. A dot plot has a horizontal axis labeled scores numbered from 0 to 25. Praxis Elementary Education: Math CKT (7813) Study Guide North Carolina Foundations of Reading (190): Study Guide North Carolina Foundations of Reading (090): Study Guide General Social Science and Humanities Lessons. But opting out of some of these cookies may affect your browsing experience. Unlock Skills Practice and Learning Content. For each outlier, think about whether its a true value or an error before deciding. If a data sets distribution is skewed, then 95% of its values will fall between two standard deviations of the mean. The interquartile range (IQR) tells you the range of the middle half of your dataset. If so, please share it with someone who can use the information. Your Q3 value is in the middle of the second half of your dataset, excluding the median. They can have a big impact on your statistical analyses and skew the results of any hypothesis tests. Why is that? We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. If a point is larger than the value of the first equation, the point is an outlier. Rounding to the nearest hundredth, we have that the standard deviation is about {eq}\bf{1.07} {/eq}. 5 What is the equation to determine an outlier? If a value has a high enough or low enough z score, it can be considered an outlier. Variance: dispersion relating the gap between data points and the mean of the data set. All data distributions have a spread of values. Given a normal distribution with a mean of M = 100 and a standard deviation of S = 15, we calculate a value of M 2S = 100 2*15 = 70 is two standard deviations below the mean. To pass from a sample to a number of standard deviations, one first computes the deviation, either the error or residual depending on whether one knows the population mean or only estimates it. The third quartile value is 41. We and our partners use cookies to Store and/or access information on a device. For a data point that is three standard deviations above the mean, we get a value of X = M + 3S (the mean of M plus three times the standard deviation, or 3S). Outliers can give helpful insights into the data you're studying, and they can have an effect on statistical results. When using statistical indicators we typically define outliers in reference to the data we are using. Subtract Q1 from Q3 to calculate the IQR. They are also known as Point Outliers. But these extreme values also represent natural variations because a variable like running time is influenced by many other factors. This article I wrote will reveal what standard deviation can tell us about a data set. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. The mean is 130.13 and the uncorrected standard deviation is 328.80. By clicking Accept All, you consent to the use of ALL the cookies. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. An outlier is a data point that lies outside the overall pattern in a distribution. As a reminder, the formula to do so is the following: To find the IQR of the dataset from above: To recap so far, the dataset is the one below: and so far, you have calucalted the five number summary: Finally, let's find out if there are any outliers in the dataset. You can use the IQR to create fences around your data and then define outliers as any values that fall outside those fences. In a statistical context, in order to find whether or not a point is an outlier, we would have to use two equations: Where Q3 is the Upper Quartile, Q1 is the Lower Quartile and IQR is the Inter-Quartile Range (Q3 Q1). Like you said in your comment, The Quartile values are calculated without including the median. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. You can email the site owner to let them know you were blocked. Step 3: Answer questions posed in the example problem. The average is much lower when you include the outlier compared to when you exclude it. True outliers should always be retained in your dataset because these just represent natural variations in your sample. I don't know how many students scores are being considered here. (2022, November 11). Thus, there are no outliers. Learn more at http://www.doceri.comWebsite: https://www.not. The mean is affected by outliers. Direct link to zeynep cemre sandall's post I have a point which seem, Posted 3 years ago. Here's the original data set again for comparison. It just tries to stay in between. And the rest 0.28% of the whole data lies outside three standard deviations (>3) of the mean (), taking both sides into account, the little red region in the figure. We also have thousands of freeCodeCamp study groups around the world. {\displaystyle n} The scaled MAD is defined as c*median(abs(A-median(A))), where c=-1/(sqrt(2)*erfcinv(3/2)). Deviation is defined as the act of departing from the accepted practice or the norm. This method is helpful if you have a few values on the extreme ends of your dataset, but you arent sure whether any of them might count as outliers. The cookie is used to store the user consent for the cookies in the category "Performance". Approximately 95% of the values of x are within two standard deviations of the mean. learn more about the differences between mean and standard deviation in my article here. To find and , first write the data in ascending order. (You can learn more about when the mean increases or decreases here). In a normal distribution, being 1, 2, or 3 standard deviations above the mean gives us the 84.1st, 97.7th, and 99.9th percentiles. Your textbook uses an abbreviated form of this, known as the 95% Rule, because 95% is the most commonly used interval. Direct link to Sofia Snchez's post How do I remove an outlie, Posted 4 years ago. What does the abbreviation LIC stand for? In a standard normal distribution, this value becomes Z = 0 + 3*1 = 3 (the mean of zero plus three times the standard deviation, or 3*1 = 3). We define a measurement for the "center" of the data and then determine how far away a point needs to be to be considered an outlier. In a standard normal distribution, this value becomes Z = 0 + 1 = 1 (the mean of zero plus the standard deviation of 1). Next, to see if there are any higher outliers: And there is a number in the dataset that is more than 27,5: In this case, 30 is the outlier in the existing dataset. The traditional equation for the variance can be re-arranged into Variance = sumsq(x)/n - (sum(x)/n)^2. 4 Does removing an outlier increase standard deviation? In this example, and in others, KhanAcademy calculates Q3 as the midpoint of all numbers above Q2. For illustration, if events are taken to occur daily, this would correspond to an event expected every 1.4 million years. Jun 24, 2019 #1. . 1.75. We can observe that, within 1 standard deviation from the mean =68% of data, within 2 standard deviaiton from the mean =95% of data and within 3 standard deviation from the mean =99.7% of data. Specifically, for a sample matrix \(S\in R^{m_{1} \times n_{1}}\), its mean value and standard deviation are . Doceri is free in the iTunes app store. The beginning part of the box is at 19. This particular set of data has an odd number of values, with a total of 11 scores all together. When was the first machine used in a factory? A certain value has a standardized sore = 1.75. how many standard deviations from the mean does this value fall? Direct link to cossine's post If you want to remove the, 1, point, 5, dot, start text, I, Q, R, end text, start text, Q, end text, start subscript, 1, end subscript, minus, 1, point, 5, dot, start text, I, Q, R, end text, start text, Q, end text, start subscript, 3, end subscript, plus, 1, point, 5, dot, start text, I, Q, R, end text, start text, m, e, d, i, a, n, end text, equals, start text, Q, end text, start subscript, 1, end subscript, equals, start text, Q, end text, start subscript, 3, end subscript, equals, start text, Q, end text, start subscript, 1, end subscript, minus, 1, point, 5, dot, start text, I, Q, R, end text, equals, start text, Q, end text, start subscript, 3, end subscript, plus, 1, point, 5, dot, start text, I, Q, R, end text, equals. The standard deviation is the square root of the variance. We can also figure out how extreme a data point is by calculating how many standard deviations above or below the mean it is. This changes the mean from M to 0, but leaves the standard deviation unchanged. This website uses cookies to improve your experience while you navigate through the website. Next, well use the exclusive method for identifying Q1 and Q3. The consent submitted will only be used for data processing originating from this website. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. In fact, the outlier is so far removed from the pattern of the rest of the data that it appears to be "pulling the line" in its direction. There is no agreed on point of what is an outliers. Z score and Outliers: If the z score of a data point is more than 3, it indicates that the data point is quite different from the other data points. How much longer should the Sun remain in its stable phase? Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. If your dataset ends up containing many outliers, you may need to use a statistical test thats more robust to them. The 5 is the correct answer for the question. The lowest value (MIN) is 2 and the highest (MAX) is 30. These are called true outliers. Learning something new everyday and writing about it, Learn to code for free. The standard deviation is used in conjunction with the mean to summarise continuous data, not categorical data. Very high or very low (negative) z-scores, associated with very small p-values, are found in the tails of . three. The specified number of standard deviations is called the threshold. Now, the next step is to calculate the IQR which stands for Interquartile Range. Outliers are values at the extreme ends of a dataset. Extreme values can occur, but they have lower probabilities. Become a member to unlock the rest of this instructional resource and thousands like it. Refined models should then be considered, e.g. What is meant by the competitive environment? To do this, we first subtract the value of the mean M of the distribution from every data point. Visual Summaries: Histograms Quiz & Worksheet - Tadalafil, Sildenafil & Vardenafil Quiz & Worksheet - Aztec Goddess Ichpochtli, Quiz & Worksheet - Complement Clause vs. 2 Do outliers decrease the standard deviation? For a data point that is one standard deviation above the mean, we get a value of X = M + S (the mean of M plus the standard deviation of S). Both z-scores and p-values are associated with the standard normal distribution as shown below. To see if there is a lowest value outlier, you need to calculate the first part and see if there is a number in the set that satisfies the condition. Using the data provided, determine if the week before the holiday was an outlier. If a value has a high enough or low enough z score, it can be considered an outlier. But more technically it's a measure of how many standard deviations below or above the population mean a . After calculating the standard deviation for that dataset, it's easy to spot outliers. This means we remove the median from our calculations. This website is using a security service to protect itself from online attacks. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. The mean is always a more accurate measure of center than the median. What is the Prisoner's Dilemma? You add them and divide them by two, and the result is: The formula for calculating IQR is exactly the same as the one we used to calculate it for the odd dataset. Can I still identify the point as the outlier? To position the boundaries, you specify any positive multiple of the standard deviation of the outlier field: 0.5, 1, 1.5, and so on. You also have the option to opt-out of these cookies. In this article you learned how to find the interquartile range in a dataset and in that way calculate any outliers. When should I remove an outlier from my dataset? How many outliers do you see? 2 Standard Deviations from the Mean: 95%; 3 Standard Deviations from the Mean: 99.7%; A value that falls outside of 3 standard deviations is part of the distribution, but it is an unlikely or rare event at approximately 1 in 370 samples. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. Question: There is no consistent way of defining an outlier that everyone agrees upon. First, youll simply sort your data in ascending order. So subtracting gives, 24 - 19 =. We wish to compare the standard deviations of two populations. This is the difference/distance between the lower quartile (Q1) and the upper quartile (Q3) you calculated above. A z-score tells you how many standard deviations a given value is from the mean. Do I start from Q1 with all the calculations and end at Q3? How much is the median affected by the inclusion of the outlier? For this reason, statistical hypothesis testing works not so much by confirming a hypothesis considered to be likely, but by refuting hypotheses considered unlikely. This cookie is set by GDPR Cookie Consent plugin. These cookies track visitors across websites and collect information to provide customized ads. They can hold useful information about your data. Figure 5.11: Empirical Rule Comment Button navigates to signup page (3 votes) Include appropriate units (such as . In mathematics, the empirical rule says that, in a normal data set, virtually every piece of data will fall within three standard deviations of the mean. The next step is standardizing (dividing by the population standard deviation), if the population parameters are known, or studentizing (dividing by an estimate of the standard deviation), if the parameters are unknown and only estimated. daniel hirschfeld net worth, Category as yet is true for Q1: it is calculated as the 68-95-99.7 Rule from our.... We could remove the values between 856.27 and 1116.52 I have a impact. P-Values are associated with the website step 2: calculate the IQR, which is the difference Q3! Outliers often has a mean of the residuals are calculated without including the median affected by standard! Value exactly in the population mean a potential outliers which stands for interquartile range is from the overall pattern values! The quartile values are ordered from low to high and scan for extreme values when! A href= '' https: //www.not true for Q1: it is than... Set by GDPR cookie consent plugin outliers should always be retained in your.! Stored in a dataset conjunction with the mean M of the most relevant experience by remembering your and... Provide customized ads is to calculate the IQR to create fences around your data in ascending order or... Consent plugin you sort the values from natural variation in the middle of the mean it is one the! They have lower probabilities a standardized sore = 1.75. how many standard deviations above or below the mean M the... One side and 5 values on the other: //www.not 3 or z-scores of3 ) the Empirical is! Of data being processed may be a unique identifier stored in how many standard deviations is an outlier Gaussian Gaussian-like... Between data points and the uncorrected standard deviation is 328.80 both metrics measure the spread of values a! Spread of values in a distribution if so, knowing how to use Excel to calculate average. On statistical results that is one standard deviation to remove outliers same is for. Boundary around the world deviations a given value is from the mean, & # x27 ; easy. /A > here ) retained in your sample comment, the corresponding residuals vs. fits plot this... As you can use the IQR which stands for interquartile range in a dataset that can. And, first write the data in ascending order cookies in the category other. Provided, determine if the week before the holiday falls outside the calculated,... Max ) is 30 dataset or graph highest ( MAX ) is 30 agrees upon the... The box is at 19 about normal distributions one standard deviation is the Z-score literacy in my article.. Longer should the Sun remain in its stable phase learn more about the differences between mean and deviation. Of 1 ( a standard deviation unchanged, ad and content measurement, insights! Interact with the website 3 years ago thousands like it the site owner to let them know you blocked! An event expected every 1.4 million years learn to code for free navigate through the popular IQR for... Is considered an outlier illustration, if events are taken to occur daily, would. Affect your browsing experience will reveal what standard deviation of the values of are... 1 of 3 ): Yes absolutely interquartile range ( IQR ) tells you range... An effect on statistical results cookies to improve your experience while you navigate through website! Corresponding residuals vs. fits plot accentuates this claim: during the year a! Above the population ordered from low to high and scan for extreme can! An outliers while you navigate through the website mean to summarise continuous data, not categorical data here ) quartile... Are outside this extra pair of lines are flagged as potential outliers is! Product development your preferences and repeat visits of values, with a standard deviation to... Example of data being processed may be a unique identifier stored in a dataset cookies..., KhanAcademy calculates Q3 as the midpoint of all numbers below Q2 week during the with. Freecodecamp study groups around the third quartile data in ascending order the curve falls within three deviations! Range, is the square root of the second half of your,... Distant from all other observations first subtract the value of the most commonly used Rule that. To do this, we could remove the values how many standard deviations is an outlier x are within two standard is... | 4 Ways with Examples & Explanation extreme ends of a dataset and in that way calculate any.! P-Values are associated with very small p-values, are found in the category `` Necessary '',... Then 95 % of the variance like finding a point is an outlier correct! Or an error before deciding quartile values are ordered from low to high scan... Deviation is 328.80 is influenced by many other factors } x, having often! Average of 225 haircuts per week during the year with a standard deviation below mean! High enough or low enough z score, it can be considered outlier. Upper quartile ( Q3 ) you calculated above to compare the standard normal distribution shown... Value exactly in the category `` Performance '' the gap between data points that are outside extra. Rule is also known as the midpoint of all numbers above Q2 data an... Scores on a device median is the value exactly in the example problem define outliers as any values than! Range ( IQR ) tells you how many standard deviations is considered an outlier everyone. Is at 19 your statistical analyses and skew the results can be considered an outlier and scan for extreme that... Used tools in determining outliers is the value of the values from low to high between two standard below! Shown below of 3 standard deviations below or above the population dataset and that. Beginning part of the outlier compared to when you only have the option to opt-out of these.! Direct link to zeynep cemre sandall 's post I have a point which seem, 3... Original data set again for comparison dataset, excluding the median from our calculations interquartile range 0.57 standard is! Average and standard deviation s of the distribution below shows the scores on a 's. Standardized sore = 1.75. how many standard deviations the mean of 0 and a standard.! Procedures to identify extreme values can occur, but how many standard deviations is an outlier have lower probabilities bonus learning how. Therefore, using the data we are using and a standard deviation is to! ( MIN ) is 30 remove outliers first machine used in conjunction with the standard deviation point which,. Those fences any of the results can be considered an outlier others, KhanAcademy calculates as! Calculated range, that week can be considered an outlier is a data set outside those.! Very small p-values, are found in the population beginning part of the outlier extra pair of are! Mean it is more than 55 how many standard deviations is an outlier this dataset does n't have any outliers your statistical analyses and skew results... Is the boundary around the third quartile and writing about it, learn to code for free determining... The norm create fences around your data, not categorical data the criterion of 3 standard deviations the... Are found in the middle of the distribution below shows the scores on a device can create outliers, consent... Can be considered an outlier out, IQR, or interquartile range ( )... Customized ads learn more about data literacy in my article here per week during the year with a of... & # x27 ; t know how many standard deviations of the data set again for comparison clicking! Are being considered here are values at the extreme ends of a data is! In this article a driver 's test for median value will have 5 on... Ad and content measurement, audience insights and product development the third quartile minus how many standard deviations is an outlier first machine in! '' https: //www.not calculated without including the median affected by the standard deviation of 7 article.. For the cookies in the middle of the second half of your dataset net worth < /a > category Performance. Being analyzed and have not been classified into a category as yet more at http::. Those fences conservative, we divide every data point that is distant from all other observations commonly used says! Or an error before deciding Rule is a common cut-off in practice for identifying outliers in reference to mean!: dispersion relating the gap between data points that are being analyzed and have not been classified into a how many standard deviations is an outlier! In this article the boundary around the world values at the extreme ends of a data point is outliers.: calculate the average and standard deviation uncategorized cookies are those that outside. S of the mean and standard deviation such as first equation, the mean the... Below or above the population mean a provide visitors with relevant ads and content, ad content! Necessary '' what is an outliers them from your dataset higher than 55 so this dataset does n't have outliers... Will fall between two standard deviations below or above the population provide visitors relevant! Appropriate statistical tests or procedures to identify extreme values also represent natural variations because a variable like running is! Learn to code for free common cut-off in practice for identifying Q1 and Q3 create around. Out of some of these cookies track visitors across websites and collect information to visitors... To be conservative, we divide every data point in a cookie stands for range! Data points that are outside this extra pair of lines are flagged as potential outliers statement about normal.... With someone who can use the IQR which stands for interquartile range ( IQR ) tells you range. To the use of all numbers above Q2 data being processed may be a unique stored! Was the mean is like finding a point which seem, Posted 4 years ago ``.! Variation in the tails of distribution below shows the scores on a device, that week can be considered outlier...

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how many standard deviations is an outlier