A survey was conducted by a group of students as a part

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 a plants in 20 houses in a locality. Find the mean number of plants per house.

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

Solution:

We may prepare the table as shown:

We know that mean, $\bar{X}=\frac{\sum f_{i} x_{i}}{\sum f_{i}}$

$=\frac{162}{20}$

 

$=8.1$

Hence, mean = 8.1

Direct method is easier than other methods. Therefore, we used direct method.

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