You can convert cumulative frequencies to relative cumulative frequencies by dividing each cumulative frequency by the total number of data values. For the 52 estimates of a minute, here are the relative cumulative frequencies:

	Interval Cumulative Frequency Relative Cumulative Frequency Fraction Decimal %
	30 to < 40 4 4/52 .077 7.7 40 to < 50 5 5/52 .096 9.6 50 to < 60 22 22/52 .423 42.3 60 to < 70 40 40/52 .769 76.9 70 to < 80 47 47/52 .904 90.4 80 to < 90 51 51/52 .981 98.1 90 to < 100 52 52/52 1.000 100.0

Problem C5

Use only the relative cumulative frequencies from this table to answer the questions below. This time, give your answers in percentages, to the nearest tenth of a percent.

a.	What percentage of the responses are in the 70s and below?
b.	What percentage of the responses are 80 or higher?
c.	What percentage of the responses are in the 50s and below?
d.	What percentage of the responses are 60 or higher?
e.	What percentage of the responses are less than 100?
f.	What percentage of the responses are at least 40 but below 70?

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