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In a primary school, the parents were asked about the number of hours they spend per day in helping their children to do homework. How many said that they helped for more than 1 and half hours?

In a primary school, the parents were asked about the number of hours they spend per day in helping their children to do homework.There were 90 parents who helped for   \frac{1}{2}  hour

to   1\frac{1}{2}  hours. The distribution of parents according to the time for which they said they helped is given in the adjoining figure; 20% helped for more than  1\frac{1}{2}  hours; 30% helped for \frac{1}{2}  hour to 1\frac{1}{2}  hours; 50 % did not help at all.

Using this, answer the following :

(iii) How many said that they helped for more than  1\frac{1}{2}   hours?

Answers (1)
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from the first question number of parents surveyed  X = 300

Given, 20% helped for more than   1\frac{1}{2}   hours.

Therefore, number of such parents = 20% of 300 = 2 x 30 = 60.

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