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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: 1, 3, 5, 6, 9, 14, 18     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
1 -7 49
3 -5 25
5 -3 9
6 -2 4
9 1 1
14 6 36
18 10 100
5Add up all the squared deviations.
Sum of Squared Deviations
224
6Divide the Sum of Squared Deviations by n-1.
Sample Variance
37.3
7Take the square root of the variance.
sample standard deviation
6.1

Check Answers

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