Thirty children were asked about a number of hours they watched TV. programs in the previous week..
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 watch television for 15 hours or more then 15 hours a week ?
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13 out of 25 radio sets are defective. find the percentages of non _ defection radios.
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(i) Here, the lowest value of the observation = 1 and the highest value of the observation = 17
∴ Class intervats are 0 – 5, 5 – 10 ., 15 – 20
The required frequency distribution table is
NCERT Solutions for Class 9 Maths Chapter 14 Statistics Ex 14.2 Q8.1
(ii) Number of children who watched television for 15 or more hours in a week = 2.
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