Q. 104.8( 9 Votes )

Answer :

For equal class intervals, we will solve by finding mid points of these classes using direct method.

We have got

Σf_{i} = 39 + p and Σf_{i}x_{i} = 2370 + 30p

∵ mean is given by

⇒ (∵ given: mean of pocket allowance is 54)

⇒ 2106 + 54p = 2370 + 30p

⇒ 54p – 30p = 2370 – 2106

⇒ 24p = 264

⇒ p = 11

Thus, p is 11.

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