Statistics in 24 hours: Find relative and cumulative frequency of the first class

The relative frequency of a class is the portion, or percentage, of the data that
falls in that class. To find the relative frequency of a class, divide the frequency
f by the sample size n.

The cumulative frequency of a class is the sum of the frequencies of that class
and all previous classes. The cumulative frequency of the last class is equal to
the sample size n.

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