A class teacher has the following absentee record of 40 students of a class for the whole term Find ...

Question

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 by the direct method

Accepted Answer

Find the midpoint of the given interval using the formula.

Midpoint (xi) = (upper limit + lower limit)/2

NCERT Solutions - Mathematics , Class 10 chapter Statistics Question 7 Solution image

The mean formula is,

Mean = x̄ = ∑f_ix_i /∑f_i

= 499/40

= 12.48 days

Therefore, the mean number of days a student was absent = 12.48.

NCERT Solutions Class 10 Mathematics Solutions for Statistics - Exercise 14.1 in Chapter 14 - Statistics