Question

Example:

20, 20, 40, 60, x
If the mean of the five numbers above is 30, what is the value of x?

Answer 1

x = 10

Explanation:

The mean of a set of values is the sum of the values divided by the total number of values.

Since there are 5 values, we can find x using the following equation:

Mean = (20 + 20 + 40 + 60 + x) / 5

(30 = (140 + x) / 5) * 5

(150 = 140 + x) - 140

10 = x

Therefore, the value of x is 10.