# A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent.

## Solution :

Here, the class size varies, and $$x_i$$’s are small,

Let us apply the direct method here :

So, Mean = $$\sum f_iu_i\over \sum f_i$$ = $$499\over 40$$ = 12.475

Hence, mean = 12.48 days