Q. 254.2( 5 Votes )
Find the mean of
Answer :
We will find the mean of the frequency distribution using step - deviation method, where A = Assumed mean and h = length of class interval.
Here, let A = 550 and h = 20
We have got
A = 550, h = 20, Σfi = 40 & Σfiui = - 12
∵ mean is given by
⇒ 
⇒ 
Thus, mean is 544.
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