# Thirty Children Were Asked About the Number of Hours They Watched TV Programmes in the Previous Week. the Results Were Found as Follows - Mathematics

Thirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows:-

 1 6 2 3 5 12 5 8 4 8 10 3 4 12 2 8 15 1 17 6 3 2 8 5 9 6 8 7 14 12

(i) Make a grouped frequency distribution table for this data, taking class width 5 and one of the class intervals as 5 - 10.

(ii) How many children watched television for 15 or more hours a week?

#### Solution

(i) Our class intervals will be 0 − 5, 5 − 10, 10 −15…..

The grouped frequency distribution table can be constructed as follows.

 Hours Number of children 0 − 5 10 5 − 10 13 10 − 15 5 15 − 20 2 Total 30

(ii) The number of children who watched TV for 15 or more hours a week is 2 (i.e., the number of children in class interval 15 − 20).

Concept: Presentation of Data
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Chapter 14: Statistics - Exercise 14.2 [Page 246]

#### APPEARS IN

NCERT Class 9 Maths
Chapter 14 Statistics
Exercise 14.2 | Q 8 | Page 246

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