Q. 54.5( 4 Votes )
Calculate the mean of the following data, using direct method:
Answer :
For equal class intervals, we will solve by finding mid points of these classes using direct method.
We have got
Σfi = 40 & Σfixi = 1980
∵ mean is given by
⇒ 
⇒ 
Thus, mean is 49.5
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