, , , ,

The mean of a set of numbers is the sum divided by the number of terms.

Add and .

Add and .

Add and .

Add and .

Divide by .

Set up the formula for variance. The variance of a set of values is a measure of the spread of its values.

Set up the formula for variance for this set of numbers.

Simplify the numerator.

Subtract from .

Raise to the power of .

Subtract from .

Raise to the power of .

Subtract from .

Raising to any positive power yields .

Subtract from .

One to any power is one.

Subtract from .

Raise to the power of .

Add and .

Add and .

Add and .

Add and .

Reduce the expression by cancelling the common factors.

Subtract from .

Cancel the common factor of and .

Factor out of .

Cancel the common factors.

Factor out of .

Cancel the common factor.

Rewrite the expression.

Approximate the result.

Find the Variance 30 , 31 , 32 , 33 , 34