approximate the mean for the following data set. round answer to one decimal place

Question

class          frequency

0-9               3

10-19           13

20-29            4 

30-39           11

40-49           13

50-49            6

Answer 1

The mean/average for each class are: 4.5, 14.5, 24.5, 34.5, 44.5, 54.5

 

Multiplying them by the given frequencies:

 4.5*3 + 14.5*13 + 24.5*4 + 34.5*11 + 44.5*13 + 54.5 * 6 = 1585

 

This is a makeshift total in absence of the real data.

 

There are 50 statistics, based on the given frequencies.

 

So the APPROXIMATE mean/average is 1585/50 = 31.7

 

Answer 2

The mean is the average of the data.

So add all the values together and divide by the number of values.

(3 + 13 + 4 + 11 + 13 + 6)/6 = 50/6 = 8.3  to one decimal place