be . Run fast! As part of a student project, high school 9. 4 students were asked to sprint 50 yards and their times (in seconds) were recorded. A cumulative relative frequency graph of the sprint times is shown here. pg 94 100 80 40 20 01 5.8 6.3 6.8 7.3 7.8 8.3 8.8 9.3 9.8 10.3 Sprint time (sec) (a) One student ran the 50 yards in 8 seconds. Is a spri- time of 8 seconds unusually slow? (b) Estimate and interpret the 20th percentile of the distribution. lative relative Cumulative relative frequency (%) 60

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