Question

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? 

Answer 1

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

The grouped frequency distribution table can be constructed as follows.  

(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).