Q23 of 40 Page 422

The mean of the following frequency distribution is 24. Find the value of p.

Let us first calculate the mid-values(xi) for each class-interval, By using the formula



By which, we get the following data



We know, that



Given, mean = 24



⇒ 1920 + 24p = 1700 + 35p


⇒ 11p = 220


⇒ p = 20


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