,

Factor out of .

Cancel the common factors.

Factor out of .

Cancel the common factor.

Rewrite the expression.

Factor out of .

Cancel the common factors.

Factor out of .

Cancel the common factor.

Rewrite the expression.

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

Combine the numerators over the common denominator.

Add and .

Multiply the numerator by the reciprocal of the denominator.

Factor out of .

Cancel the common factor.

Rewrite the expression.

Divide.

The mean should be rounded to one more decimal place than the original data. If the original data were mixed, round to one decimal place more than the least precise.

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.

To write as a fraction with a common denominator, multiply by .

Combine and .

Combine the numerators over the common denominator.

Simplify the numerator.

Multiply by .

Subtract from .

Divide by .

Raise to the power of .

To write as a fraction with a common denominator, multiply by .

Combine and .

Combine the numerators over the common denominator.

Simplify the numerator.

Multiply by .

Subtract from .

Divide by .

Raise to the power of .

Add and .

Simplify the expression.

Subtract from .

Divide by .

Approximate the result.

Find the Variance 14/21 , 8/12