Question

In a survey that asked about 75 people about their fitness schedules, 50 of the respondents said they spent an average of 45 minutes a day exercising. The rest said they spent an average of 30 minutes a day exercising.

What is the average time spent exercising by all the respondents?

A. 42 minutes

B. 33 minutes

C. 38 minutes

D. 40 minutes

Answer 1

D. 40 minutes

Explanation:

Answer 2

Average=mean

Mean= sum of scores divided by number of scores

50 responders spend 45 minutes


The others spend 30 minutes


75-50= 25


So, 25 responders spend 30 minutes


50*45+25*30 divided by 75 ( because 75 is the total number of responders)


Which equals to 40 minutes