Construct a frequency table for the following weights (in gm) of 35 mangoes using equal class intervals and answer the question given below.
31, 40, 45, 32, 43, 50, 55, 62, 70, 70, 61, 62, 53, 52, 50, 42, 36, 37, 53, 55, 65, 70, 73, 74, 45, 46, 58, 59, 60, 62, 74, 34, 33, 70, 68.
What is the class mark of the class interval 41-45?

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42.5

38.5

answer is B.

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Detailed Solution

The frequency distribution chart for the given data will be:

Class mark is the average of the upper limit and the lower limit of a class in a frequency distribution.

$∴$ Class mark for the class interval 41-45:

Class mark= $\frac{40 + 45}{2} = \frac{85}{2} = 42.5$

Therefore, 42.5 is the correct answer.

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