RRB NTPC Prelims Model Paper 2 with solutions

Question : 97 of 101

Marks: +1, -0

People were asked about the time in a week they spend in doing social work in their community. They said 10, 7, 13, 20 and 15 hours respectively. Find the mean (or average) time in a week devoted by them in social work.

12 hours
14 hours
13 hours
11 hours

Validate

Solution:

(3) The mean =(Sum of all the observations)/(Total number of observations) =

{10+ 7+ 13 +20+ 15 }/5=65/5=13

So, the average time spent by these 5 people in doing social work is 13 hours in a week.

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