The Arithmetic Mean | Elementary

The arithmetic mean of a list of data is the value that each piece of data would have if its sum was equally distributed.

Example:

The sum of these 3 pieces of data is 12.

By dividing the sum equally among the number of data, the value of each piece of data becomes 4.

To calculate an arithmetic mean, follow these steps:

1. Add all the data to find the sum.

2. Divide this sum by the number of data.

Find the mean of these data values: 8, 14, 5, 22 and 11.

The mean of 8, 14, 5, 22 and 11 is 12.
(8 + 14 + 5 + 22 + 11) ÷ 5 = 12

Find the mean of these data values: 31, 6, 12, 9, 25, 17, 1 and 9.

The mean of 31, 6, 12, 9, 25, 17, 1 and 9 is 13.75.
(31 + 6 + 12 + 9 + 25 + 17 + 1 + 9) ÷ 8 = 13.75

Find the mean of these data values: 72%, 84% and 63%.

The mean of 72%, 84% and 63% is 73%.
(72 + 84 + 63) ÷ 3 = 73