chapter-header

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

Question 7 Statistics - Exercise 14.1

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.

Number of days 0-6 6-10 10-14 14-20 20-28 28-38 38-40
Number of students 11 10 7 4 4 3 1

Answer:

Find the midpoint of the given interval using the formula.

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

The mean formula is,

Mean = x̄ = ∑fixi /∑fi

= 499/40

= 12.48 days

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

Connect with us on social media!
2022 © Quality Tutorials Pvt Ltd All rights reserved