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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, 83, 60, 81, 95
Find the modal class. (The ''Modal class'' is the class containing the greatest frequency).

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The correct Answer is:
The middle of 20 is 10. If I count from the top, 10 will fall in the class interval 81-90. If I count from the bottom and go up, 10 will fall in the class interval 81-90. The class interval that contains the median is 81-90.
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