Combine the numerators over the common denominator.
Step 3
Simplify each term.
Multiply by .
Multiply by .
Multiply by .
Multiply by .
Step 4
Simplify by adding and subtracting.
Add and .
Add and .
Add and .
Subtract from .
Step 5
The mean of a set of numbers is the sum divided by the number of terms.
Step 6
Divide by .
Step 7
Divide.
Step 8
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.