If the mean of the data set is 8 points, find the missing number of points.
Answer:
9
Step-by-step 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