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Question

Thirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows:
$$\begin{matrix} 1 & 6 & 2 & 3 & 5 & 12 & 5 & 8 & 4 & 8 \\ 10 & 3 & 4 & 12 & 2 & 8 & 15 & 1 & 17 & 6 \\ 3 & 2 & 8 & 5 & 9 & 6 & 8 & 7 & 14 & 12 \end{matrix}$$

(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?


Solution

 Number of hours Frequency
 0-510 
5-1013
 10-15
 15-20
 Total30 
(i) Above table
(ii) Number of children who watched TV for $$15$$ hours or more $$= 2$$ children.

Mathematics
NCERT
Standard IX

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