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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 they did not help?

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}   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 :

How many said that they did not help?

Answers (1)

best_answer

Let the number of parents surveyed be X.

30% of them helped for for   \frac{1}{2}  hour to 1\frac{1}{2}   hours.

In total, there were 90 such parents.

\therefore 30% of X = 90

\Rightarrow \frac{30}{100}\times X = 90 \\ \Rightarrow X = 90\times100 /30 = 300

Therefore, There were total of 300 parents who were surveyed.

from the previous question number of parents surveyed X = 300.

Given, 50% did not help.

Therefore, number of parents that did not help = 50% of 300 = 150.

 

Posted by

HARSH KANKARIA

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