Q. 74.6( 10 Votes )

The marks of 30 students of a class, obtained in a test (out of 75), are given below:

42, 21, 50, 37, 42, 37, 38, 42, 49, 52, 38, 53, 57, 47, 29

59, 61, 33, 17, 17, 39, 44, 42, 39, 14, 7, 27, 19, 54, 51.

Form a frequency table with equal class intervals. (Hint : one of them being 0-10)

Answer :

Given are marks of 30 students of a class, obtained in a test (out of 75).

Note that these marks lie between 0 to 75.


So, these should be distributed in a way such that, the interval remains same in each distribution.


If we distribute it in a class interval equals to 5. Then, range would get maximized, i.e., 0-5, 5-10, 10-15, 15-20, …, 70-75.


But if we distribute it in a class interval of 10. Then the range will be optimized.


So, let’s make a table.



Thus, this is the required frequency distribution table.


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