Answer :

We will find the mean weight using step - deviation method, where A = Assumed mean and h = length of class interval.

Here, let A = 92 and h = 5


Since, the class intervals are inclusive type, we’ll first convert it into exclusive type by extending the class interval from both the ends.



We have got


A = 92, h = 5, Σfi = 60 & Σfiui = - 19


mean is given by





Thus, mean weight is 90 g.


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