Q. 14.4( 389 Votes )

A survey was cond

Answer :

The above given data can be represented in the form of table as below:

Mean can be calculated as follows:

where fi = frequency of ith class and
        xi = mid value of ith class

= 8.1

We will use the direct method in this as the values of xi and fi are small. 
You can also use assumed mean method, but it's not necessary as the values are very small and assumed mean method is better for large values.

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