Weight of 60 eggs

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, Σf_i = 60 & Σf_iu_i = - 19

∵ mean is given by

⇒

⇒

Thus, mean weight is 90 g.