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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: 1, 6, 7, 10, 11, 12, 14     Load another set of data

1Add up all the values.
Sum
61
2Square this sum
Sum Squared
3721
3Count the total number of values.
n
7
4Divide Sum Squared by the the total number of values
Avg. Sum Squared
531.57
5Square each individual value. 
612 1
762 36
872 49
9102 100
10112 121
11122 144
12142 196
13Add up all these squared values.
Sum of Squares
647
14Subtract Sum of Squares - Avg. Sum Squared 115.43
15Divide this by the total number of values minus 1.
sample variance
19.24
16Take the square root of the variance.
sample standard deviation
4.39

Check Answers

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