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The Standard Deviation :: Standard Deviation Calculation
Calculate the Standard Deviation for the following data using the calculator to the right (round to 1 decimal points). Click on the Check Answer button to see how you did.

Data: 2, 3, 5, 8, 10, 13, 15     Load another set of data

1Add up all the values.
Sum
56
2Count the total number of values.
n
7
3Divide the Sum by the the total number of values.
Mean
8
4Subtract the mean from each value. Then Square that result.

ValueValue-Mean(Value-Mean)2
2 -6 36
3 -5 25
5 -3 9
8 0 0
10 2 4
13 5 25
15 7 49
5Add up all the squared deviations.
Sum of Squared Deviations
148
6Divide the Sum of Squared Deviations by n-1.
Sample Variance
24.7
7Take the square root of the variance.
sample standard deviation
5

Check Answers

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