# Population Variance V(X) and Standard Deviation (Q1c-d)

Variance for a probability distribution differs (in its calculation) from the variance you learned in Chapter 4. In this video, I extend the tabular approach that I used in the previous video (to find the expected value) in order to find the variance of x.

## Order of operations is very important here:

1st » Brackets: (x – μ)

2nd » Exponents: (x – μ)²

3rd » Division: … no division in this formula…

4th » Multiplication: (x – μ)² x P(x) « multiplication symbol normally hidden

5th » Addition: Σ(x – μ)²P(x)

6th » Subtraction: … completed within brackets

## Standard Deviation of X:

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