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?
(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).
