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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: 5, 10, 11, 13, 14, 15, 18     Load another set of data

1Add up all the values.
Sum
86
2Square this sum
Sum Squared
7396
3Count the total number of values.
n
7
4Divide Sum Squared by the the total number of values
Avg. Sum Squared
1056.57
5Square each individual value. 
652 25
7102 100
8112 121
9132 169
10142 196
11152 225
12182 324
13Add up all these squared values.
Sum of Squares
1160
14Subtract Sum of Squares - Avg. Sum Squared 103.43
15Divide this by the total number of values minus 1.
sample variance
17.24
16Take the square root of the variance.
sample standard deviation
4.15

Check Answers

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