Maths Class 11 Chapter 15. Statistics | Page 11

Solution:
Continuous frequency distribution
A continuous frequency distribution is a series in which the data are classified into different class-intervals without gaps along with their respective frequencies.
While calculating the mean of a continuous frequency distribution, we had made the assumption that the frequency in each class is centered at its mid-point. Here also, we write the mid-point of each given class and proceed further as for a discrete frequency distribution to find the mean deviation.