Answer:
b) range = 50
c) modal class: 30--40
d) median class: 20--30
Explanation:
b)
As you have observed, the range is the difference between the minimum and the maximum: 50 - 0 = 50. (Of course, neither the minimum nor the maximum may be at the extreme ends of the lowest and highest classes.)
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c)
The modal class is the class with the largest number of members. We observe that 19 is the highest frequency value, and the class having that frequency is ...
30--40 . . . modal class
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d)
The median class is the class containing the 50th-percentile value. It will be the class in which the middle one (or two) data points resides. If we look at the cumulative total of Frequency, we see it is ...
3, 13, 27, 46, 50
That is, there are 50 data points total, and the 25th (and 26th) lie in the 20--30 class.
The median class is 20--30.