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