Hello, can anyone explain how do you figuer out type of problem? how do you find the relative frequencies, and cumulative frequencies?

Hello, can anyone explain how do you figuer out type of problem? how do you find the relative frequencies, and cumulative frequencies?

How long does it take to finish the 1161-mile Iditarod Dog Sled Race from Anchorage to Nome, Alaska? Finish times (to the nearest hour) for 57 dogsled teams are shown below.

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For this problem, use five classes.

find the width?