The mean of a set of numbers is the sum divided by the number of terms.
12+27.52
Step 4
Add 12 and 27.5.
39.52
Step 5
Divide39.5 by 2.
19.75
Step 6
Divide.
19.75
Step 7
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.