![]() The standard deviation of the values 2, 1, 3, 2 and 4 is 1.01.Ī class of students took a math test. Determine the average of those squared numbers to get the variance. Square each of those differences: -0.4 x -0.4 = 0.16Ĥ. Subtract the mean from each value: 2 - 2.4 = -0.4ģ. That’s the standard deviation!įor example: Take the values 2, 1, 3, 2 and 4.ġ. (In sample sizes, subtract 1 from the total number of values when finding the average.) Determine the average of the squared numbers calculated in #3 to find the variance.Subtract the mean ( x̄) from each value.Determine the mean (the average of all the numbers) by adding up all the data pieces ( xi) and dividing by the number of pieces of data ( n). ![]() In order to determine standard deviation: ![]() If you’re wondering, “What is the formula for standard deviation?” it looks like this: You can find the standard deviation by finding the square root of the variance, and then squaring the differences from the mean. Standard deviation measures how far results spread from the average value.
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