First, work out the
average, or arithmetic mean, of the numbers:
Sum:
13
(All the numbers added up)
Mean:
2.6
(Arithmetic mean = Sum / Count)
Then, take each number, subtract the
mean and square the result:
Differences:
(Every Number minus Mean)
Differences2:
(Square of each difference)
Now calculate the Variance:
Sum of Differences2:
109.2
(Add up the Squared Differences)
Variance:
21.84
(Sum of Differences2 / Count)
Lastly, take the square root of the Variance:
Standard Deviation:
4.673328578
(The square root of the Variance)
