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Review for Exam 2
1.
In a statistics class with 15 males and 13 females, 5 students are selected to put
problems on the board.
a.
What is the probability that of the 5 selected 3 are females?
b.
What is the probability that of the 5 selected 2 are males?
c.
What is the probability that of the 5 selected 2 are males and 3 are
females?
d.
What is the probability that the group of students selected has either 3
females or 2 males?
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2.
Customers use an automatic teller machine at an average rate of 7 per hour.
a.
What is the probability that exactly 10 people will use the ATM in the
next hour?
b.
What is the probability that 12 or more people will use the ATM in the
next hour?
c.
What is the probability that less than 6 people will use the ATM in the
next hour?
3.
A statistics instructor collected data on the time it takes the students to complete a
test. The students take anywhere between 35 minutes and 55 minutes. There is an
equally likely chance that students will take 35 minutes as it is they will take 55
minutes.
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 Spring '08
 Dr.Lohaka
 Normal Distribution, Probability, Small business Administration, Captain D

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