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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: 2, 8, 13, 14, 17, 19, 21     Load another set of data

1Add up all the values.
Sum
94
2Square this sum
Sum Squared
8836
3Count the total number of values.
n
7
4Divide Sum Squared by the the total number of values
Avg. Sum Squared
1262.29
5Square each individual value. 
622 4
782 64
8132 169
9142 196
10172 289
11192 361
12212 441
13Add up all these squared values.
Sum of Squares
1524
14Subtract Sum of Squares - Avg. Sum Squared 261.71
15Divide this by the total number of values minus 1.
sample variance
43.62
16Take the square root of the variance.
sample standard deviation
6.6

Check Answers

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