Children were asked about the number of hours they play- and the responses have been recorded as follows- No- of hours No- of children- 0-2 7- 2-4 11- 4-6 15- 6-8 9- 8-10 8- - How many children participated in the survey-

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Standard IX

Mathematics

Introduction to Statistics

Children were...

Question

Children were asked about the number of hours they play, and the responses have been recorded as follows.
$\begin{matrix} N o . o f h o u r s & N o . o f c h i l d r e n 0 - 2 & 7 2 - 4 & 11 4 - 6 & 15 6 - 8 & 9 8 - 10 & 8 \end{matrix}$

How many children participated in the survey?
50

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Solution

The correct option is A 50
The number of children participated in the survey = 7+ 11 + 15 + 9 + 8 = 50.

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Q. Children were asked about the number of hours they play, and the responses have been recorded as follows.

\begin{matrix} N o . o f h o u r s & N o . o f c h i l d r e n 0 - 2 & 7 2 - 4 & 11 4 - 6 & 15 6 - 8 & 9 8 - 10 & 8 \end{matrix}

How many children participated in the survey?

Q. Children were asked about the number of hours they play, and the responses have been recorded as follows.

\begin{matrix} N o . o f h o u r s & N o . o f c h i l d r e n 0 - 2 & 7 2 - 4 & 11 4 - 6 & 15 6 - 8 & 9 8 - 10 & 8 \end{matrix}

How many children participated in the survey?

Q. 30 children were asked about the number of hours they watched TV programmes last week. The results are recorded as under :

Number of hours	$0 - 5$	$5 - 10$	$10 - 15$	$15 - 20$
frequncy	$8$	$16$	$4$	$2$

What is the number of children who watched TV for 10 or more hours a week?

Question 7
30 children were asked about the number of hours they watched TV programs last week. The results are recorded as under:

$\begin{matrix} Number of hours & 0 - 5 & 5 - 10 & 10 - 15 & 15 - 20 Frequency & 8 & 16 & 4 & 2 \end{matrix}$

Can we say that the number of children who watched TV for 10 or more hour in a week is 22? Justify your answer.

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?

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Children were asked about the number of hours they play, and the responses have been recorded as follows. No.ofhoursNo.ofchildren0−272−4114−6156−898−108 How many children participated in the survey?50

The correct option is A 50The number of children participated in the survey = 7+ 11 + 15 + 9 + 8 = 50.

Children were asked about the number of hours they play, and the responses have been recorded as follows.
$\begin{matrix} N o . o f h o u r s & N o . o f c h i l d r e n 0 - 2 & 7 2 - 4 & 11 4 - 6 & 15 6 - 8 & 9 8 - 10 & 8 \end{matrix}$

How many children participated in the survey?
50

The correct option is A 50
The number of children participated in the survey = 7+ 11 + 15 + 9 + 8 = 50.