Question

The following data points represent the number of points scored last basketball game by each player on the Dragons basketball team.

5,8,11,7,?

If the mean of the data set is 8 points, find the missing number of points.

Answer 1

The missing number is 9.

Answer 2

9

Explanation:

There are 5 data points. To find the mean, we add the data and divide by 5

(5+8+11+7+?) /5 = 8

Multiply each side by 5

(5+8+11+7+?) /5 *5 = 8*5

(5+8+11+7+?) = 40

Combine like terms

? + 31 = 40

Subtract 31 from each side

? +31-31 = 40-31

? = 9

The missing number is 9