Answer :

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

Let a = 57

Now, the mean of the deviation can be calculated as follows:

where ,

f_{i} = frequency of the ith class

d_{i} = x_{i} - a

a = assumed mean of the data

= 0.1875

Mean can be calculated as follows:

=

where, a = assumed mean of the data= 0.1875 + 57

Mean = 57.1875

≈ 57.19**Hence, the mean of the given data is 57.19.**

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