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?
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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