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Test scores out of 100 for a class of 20...

Test scores out of 100 for a class of 20 students are as follows:
93, 84, 97, 98, 100, 78, 86, 100, 85, 92, 55, 91, 90, 75, 94, 93, 60, 81, 95
(a) Make a frequency table taking class interval as 91-100, 81-90, ...
(b) Find the modal class (The "Modal class" is the class containing the greatest frequency).
(c) find the interval that contains the median.

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