Question

Below is the histogram of number of hours spent by students on mobile phones. How many students spend more than 2 hours and less than 5 hours on mobile phone?

(a) 31

(b) 43

(c) 22

(d) 21

The question was posed to me in a national level competition.

Asked question is from Data Handling topic in chapter Data Handling of Mathematics – Class 8

Answer 1

Correct answer is (c) 22

To explain I would say: The height of the bar represents the number of data items in the given data range called frequency. The number of students spending more than 2 hours and less than 5 hours on mobile phone is sum of frequency of 2-3, 3-4 and 4-5 which is 22.