Answer:
divide the sum by the number of numbers
Explanation:
The arithmetic mean of a group of numbers is the quotient of the sum of the numbers and the number of numbers in the group.
For two numbers, the mean is their sum divided by 2:
mean of A and B is (A+B)/2
For 5 numbers, the mean is their sum divided by 5:
mean of (A, B, C, D, E) is (A +B +C +D +E)/5
_____
The arithmetic mean is also called the average.