Q. 24.5( 25 Votes )

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.

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

Answer :

Let us find class marks (xi) for each interval by using the relation.

Class mark (xi) =

Now we may compute xi and fixi as follows:

Fro, the table we may observe that,

fi = 20

fixi = 162

Mean, X̅ =

= = 8.1

So mean number of plants per house is 8.1

We have used for the direct method values xi and fi are very small.

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