Problem #2
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WSU Student Driving
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| A student in the Computer Science department of Weber
State University drives from his home in the suburbs near Riverton to
the campus located in Ogden. The driving times are normally distributed
with a mean of 35 minutes and a standard deviation of 8 minutes.
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| A. In what percent of the days will it take him 30 minutes or less to
drive to school?
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| B. In what percent of the days will it take 40 minutes or more to
drive to school?
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| C. Explain to the user of your web page why the probability is
nearly 0 that it will take him exactly 40 minutes to get to school.
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| D. Since the user did not understand your answer to part C, how would
you estimate the percent of days in which it takes 40 minutes to
drive to work? (Hint: Within what range of values would the times
be rounded to 40?)
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| E. Some days there will be accidents or delays, so the trip will take
longer than usual. How long will the longest 10 percent of the
trips take?
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