Out of all the numbers,
Minimum = 23
Maximum = 98
So, we start taking the classes from 20. We can also take an interval of 5 and write our classes as20-25, 25-30, 30-35,...
But that would be too lengthy, so we take intervals of 10.20-29, 30-39, 40 - 49, ...
We can also take continuous classes also, the answer will be the same20-30, 30-40, 40-50, ....
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