The mean of a set of numbers is the sum divided by the number of terms.
Step 3
Simplify the numerator.
To write as a fraction with a common denominator, multiply by .
Combine and .
Combine the numerators over the common denominator.
Write as a fraction with a common denominator.
Combine the numerators over the common denominator.
Rewrite in a factored form.
Multiply by .
Add and .
Add and .
Divide by .
Step 4
Divide by .
Step 5
Divide.
Step 6
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.