Question

Thirty children wereasked about the number of hours they watched TV programmes in theprevious 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, takingclass width 5 and one of the class intervals as 5 - 10.

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

Answer 1

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

Thegrouped 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 aweek is 2 (i.e., the number of children in class interval 15 −20).