Q. 65.0( 2 Votes )

Find the missing frequency p for the following frequency distribution whose mean is 28.25.

Answer :

Let’s draw the table and calculate the relative value of variables ∑xi×fi



By putting the formula of mean we get;


Mean = = 28.25 (given)



28.25(50 + P) = 1445 + 25P


28.25×50 + 28.25×P = 1445 + 25P


1412.50 + 28.25P = 1445 + 25P =


28.25P – 25P = 1445 – 1412.50


3.25P = 32.5



= 10


Hence the value of P is 10.


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