Question: Computer use Mrs. Causey asked her students how much time they had spent using a computer during the previous week. The following figure shows a

Computer use Mrs. Causey asked her students how much time they had spent using a computer during the previous week. The following figure shows a cumulative relative frequency graph of her students’ responses.

(a) At what percentile does a student who used her computer for 7 hours last week fall?

(b) Estimate the interquartile range (IQR) from the graph. Show your work.

100 90 80 70 Cumulative relative frequency (%) 60 50 40 30

100 90 80 70 Cumulative relative frequency (%) 60 50 40 30 20 10 0 0 3 6 9 12 15 18 21 24 27 30 Hours per week

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