Q. 24.5( 34 Votes )

A survey was cond

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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