Log-in | Contact Jeff | Email Updates
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, 4, 6, 10, 14, 19, 20     Load another set of data

1Add up all the values.
Sum
75
2Square this sum
Sum Squared
5625
3Count the total number of values.
n
7
4Divide Sum Squared by the the total number of values
Avg. Sum Squared
803.57
5Square each individual value. 
622 4
742 16
862 36
9102 100
10142 196
11192 361
12202 400
13Add up all these squared values.
Sum of Squares
1113
14Subtract Sum of Squares - Avg. Sum Squared 309.43
15Divide this by the total number of values minus 1.
sample variance
51.57
16Take the square root of the variance.
sample standard deviation
7.18

Check Answers

How well did you understand this lesson?

Avg. Rating 7.64 (151)

Not at all    Neutral    Extremely
012345678910

What didn't make sense?