s21ch3hw

# s21ch3hw - Statistics 21: Homework 1 1. The table below...

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Statistics 21: Homework 1 1. The table below depicts data collected in a (hypothetical) survey studying the distribution of traﬃc speed on the Bay Bridge. Each group includes the left end-point but not the right. (So, for instance, the ﬁrst group includes cars driving 0 mph (not moving) but does not include cars driving exactly 10 mph.) Use this information to answer the following questions: Speed (mph) Percentage of Total Cars 0-10 20 10-20 10 20-40 40 40-80 20 80-95 10 (a) Draw a histogram of speed on the density scale. (b) Approximately how many cars are going less than 25 miles per hour? (c) Approximately how many cars are going between 18 and 72 miles per hour? (d) Approximate the 32nd percentile of speed. (e) Approximate the median speed. (f) Which percentile is 47 miles per hour? (g) Would you estimate that there are more cars going between 15 and 16 than between 65 and 66 miles per hour? (h) The speed limit on the bridge is 50 miles per hour. Approximately what percentage of

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## This note was uploaded on 10/12/2008 for the course STAT 21 taught by Professor Anderes during the Spring '08 term at Berkeley.

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s21ch3hw - Statistics 21: Homework 1 1. The table below...

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