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30 children were asked about the number of hours they watched TV programmes last week. The results are recorded as under :
Number of hours 0-5 5-10 10-15 15-20
Frequency 8 16 4 2
Can we say that the number of children who watched TV for 10 or more hours a week is 22? Justify your answer.

Solution:

In the table provided,

Number of children who watched TV for 10 or more hours is 10-15 and 15-20 hours

So we can write it as

Number of children who watched TV for 10 or more hours is 10-15 and 15-20 hours = 4 + 2 = 6

So it is not true to say that the number of children who watched TV for 10 or more hours a week is 22.

Therefore, we cannot say that the number of children who watched TV for 10 or more hours a week is 22.

✦ Try This: 50 children were asked about the number of hours they watched TV programmes last week. The results are recorded as under :

Number of hours	0-5	5-10	10-15	15-20
Frequency	5	10	15	20

Can we say that the number of children who watched TV for 10 or more hours a week is 12? Justify your answer.

In the table provided,

Number of children who watched TV for 10 or more hours is 10-15 and 15-20 hours

So we can write it as

Number of children who watched TV for 10 or more hours is 10-15 and 15-20 hours = 15 + 20 = 35

So it is not true to say that the number of children who watched TV for 10 or more hours a week is 12.

Therefore, we cannot say that the number of children who watched TV for 10 or more hours a week is 12.

☛ Also Check: NCERT Solutions for Class 9 Maths Chapter 14

NCERT Exemplar Class 9 Maths Exercise 14.2 Problem 7

30 children were asked about the number of hours they watched TV programmes last week. The results are recorded as under : Number of hours 0-5 5-10 10-15 15-20 Frequency 8 16 4 2 Can we say that the number of children who watched TV for 10 or more hours a week is 22? Justify your answer.

Summary:

30 children were asked about the number of hours they watched TV programmes last week. The results are recorded in a table. We cannot say that the number of children who watched TV for 10 or more hours a week is 22

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