Question

Thirty children were asked about the number of hours they watched T.V. 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

Given : Thirty children were asked about the number of hours they watched T.V. programmes in the previous week and 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) Class intervals of the given data will be 0 - 5, 5 - 10, 10 - 15, 15 - 20 …

The grouped frequency distribution table is as follows:

HOURS  → NO. OF CHILDREN

0 - 5  →  10

5 - 10  → 13

10 - 15  → 5

15 - 20   → 2

TOTAL → 30

(ii)  2 children watched television for 15 or more hours a week.

[No. of children in class interval 15 - 20]

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Answer 2

Step-by-step explanation:

Given :-

Thirty children were asked about the number of hours they watched T.V. programmes in the previous week and 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) our class intervals will be 0-5,5-10,10-15,15-20

The grouped frequency distribution table can be 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)