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Stat 201
Recitation Worksheet III
1.
Bob drives home from work to his home in the suburbs, leaving his office in University
City at 4:02 PM.
He listens to the traffic report on KYWAM as he drives out of the
parking garage.
If the report says that I95 has no backups, he takes that route.
Otherwise,
he takes the surface roads.
Historically, the report says that I95 has no backups 55% of
the time.
Assume that what happens on any given day is independent of what happens on
any other day.
(a)
What is the probability that he will take I95 on seven of the next ten work days?
(b)
What is the probability that he will take I95 on at least two of the next 10 work
days?
(c)
Let
X
represent the number of times that he will take I95 during the next ten work
days.
What is the mean and standard deviation of
X
?
2.
Suppose that the time that it takes Sue to get to work is a random variable having a uniform
distribution with a minimum of 40 minutes and a maximum of 60 minutes.
What is the
probability that it will take Sue at least 48 minutes to get to work?
Also, what is the mean
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This note was uploaded on 09/26/2011 for the course STAT 201 taught by Professor Drex during the Spring '04 term at Drexel.
 Spring '04
 DREX
 Statistics

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