On flights from San Francisco to Chicago, the number of empty seats are to be grouped into

Question:

On flights from San Francisco to Chicago, the number of empty seats are to be grouped into the following classes: 0-4, 5-9, 10-14, 15-19, more than 19.
Is it possible to determine from this frequency the exact number of flights on which there were:
(a) Fewer than 10 empty seats?
(b) More than 14 empty seats?
(c) At least 5 empty seats?
(d) Exactly 9 empty seats?
(e) Between 5 and 15 empty seats inclusively?
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