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The Standard Deviation :: Standard Deviation Calculation Short-Cut Method
This method might be a bit faster to calculate. 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: 6, 8, 9, 10, 13, 14, 17     Load another set of data

1Add up all the values.
Sum
77
2Square this sum
Sum Squared
5929
3Count the total number of values.
n
7
4Divide Sum Squared by the the total number of values
Avg. Sum Squared
847
5Square each individual value. 
662 36
782 64
892 81
9102 100
10132 169
11142 196
12172 289
13Add up all these squared values.
Sum of Squares
935
14Subtract Sum of Squares - Avg. Sum Squared 88
15Divide this by the total number of values minus 1.
sample variance
14.67
16Take the square root of the variance.
sample standard deviation
3.83

Check Answers

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