# 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:**

We will solve this question by the assumed mean method.

Mean, (x) = a + (Σf_{i}d_{i}/ Σf_{i})

We know that, Class mark, x_{i} = (Upper class limit + Lower class limit)/2

Taking assumed mean, a = 17

From the table, we obtain, Σf_{i} = 40 and Σf_{i}u_{i} = - 181

Mean, (x) = a + (Σf_{i}d_{i}/ Σf_{i})

= 17 + (- 181/40)

= 17 - 4.525

= 12.475

≈ 12.48

Thus, the mean number of days a student was absent is 12.48

**Video Solution:**

## 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

### NCERT Solutions for Class 10 Maths - Chapter 14 Exercise 14.1 Question 8:

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

The mean number of days a student was absent based on the absentee record of 40 students of a class for the whole term is 12.48