, ,

Rewrite the division as a fraction.

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

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 .

Add and .

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 .

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.

Find the Mean (Arithmetic) 45 , 5÷44 , 5