The mean of a set of numbers is the sum divided by the number of terms.
Cancel the common factor of and .
Factor out of .
Factor out of .
Factor out of .
Cancel the common factors.
Factor out of .
Cancel the common factor.
Rewrite the expression.
Divide by .
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 .
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.