Variance

Variance

S: Sample
Sigma: Population
E: Sum
X^i: Numbers
N: How many numbers you have
X Bar: Average
S= Sample Standard Deviation

The smaller the number the closer the numbers are together.
The bigger the number the more the numbers are spread out.

Here are the amounts of gold coins the 5 pirates have:

4, 2, 5, 8, 6.

Now, let's calculate the standard deviation:

1. Calculate the mean:

2. Calculate  for each value in the sample:

3. Calculate :

4. Calculate the standard deviation:

The standard deviation for the amounts of gold coins the pirates have is 2.24 gold coins.