If the mean of th

Given that, mean = 24

We need to find the value of p.

To find p, we need to calculate mean by direct method.

Let us make a table showing frequencies, midpoints and fixi.

We have

∑fixi = 1700 + 35p

∑fi = 80 + p

By direct method, we have the formula of arithmetic mean:

24 × (80 + p) = 1700 + 35p

1920 + 24p = 1700 + 35p

35p – 24p = 1920 – 1700

11p = 220

p = 20

Thus, p = 20.

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