Question

A survey was conducted by a group of students as a part of their environment awareness Programme, in which they collected the following data regarding the number of plants in 20 houses in a locality. Find the mean number of plants per house.

Number of plants	0-2	2-4	4-6	6-8	8-10	10-12	12-14
Number of houses	1	2	1	5	6	2	3

Which method did you use for finding the mean and why?

Answer 1

Calculation of mean number of plants per house

Here, we used the direct method to find mean because numerical values of x_i and f_i are small.