Answer :

The class interval in the data is having varying width.

**(i)** We know that the area of the rectangle is proportional to the frequencies in the histogram.

The class interval with minimum class size 2 is selected and the length of the rectangle is proportional to it. The proportion of the surnames per 2 letters interval can be calculated as:

**(ii)** The class interval in which the maximum number of surname lie is 6-8.

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