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STA4321
Practice Exam 1
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1. Suppose that
A
and
B
are independent events. Show that
A
and
B
c
are independent. [8 pts]
2. A study is to be conducted in a hospital to determine the attitudes of nurses toward various
administrative procedures. A sample of 10 nurses is to be selected from a total of 90 nurses
employed in the hospital.
(A) How many diﬀerent samples of 10 nurses can be selected? [4 pts]
(B) Twenty of the 90 nurses are male. If 10 nurses are randomly selected from those employed
by the hospital, what is the probability that the sample of the 10 nurses will include exacly
4 male (and 6 female) nurses? [4 pts]
(C) What is the probability that the sample will include 10 male (and 0 female) nurses? [4 pts]
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View Full Document3. A communications network has a builtin safeguard system against failures. In this system if
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 Spring '08
 Staff
 Probability

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