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Unformatted text preview: STA 4321/5325  Spring 2010
Quiz 2  January 29
Name:
There are ﬁve problems in this quiz. Each problem has exactly one correct answer.
Problem 1 The probability that Traver eats breakfast and gets to work on time is 0.2. The
probability that he eats breakfast is 0.4. If Traver eats breakfast, what is the probability that he
is on time for work?
(a) 0.6
(b) 0.2
(c) 0.08
(d) 0.5
Problem 2 Let A and B be two independent events such that P (A) = 0.4 and P (B ) = 0.6.
Then P (A ∩ B ) is equal to
(a) 1
(b) 0.2
(c) 0.24
(d) 0.67
Problem 3 If A and B are mutually exclusive and independent events, then it is always true
that
(a) P (A) = 0 and P (B ) = 0
(b) P (A) = 0 or P (B ) = 0
(c) P (A) = 0.5 and P (B ) = 0.5
(d) P (A) = P (B ) 1 ¯
Problem 4 Let A and B be two events. Remember that the set B denotes the complement of
¯ A) is equal to
the set B . Then P (B A) + P (B
(a) P (A)
(b) P (B )
(c) 0
(d) 1
Problem 5 Let A and B be two independent events in sample space S . Then P (A ∩ B ) = P (AB )P (B S )
This statement is
(a) True
(b) False 2 ...
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This note was uploaded on 06/05/2011 for the course STA 4321 taught by Professor Staff during the Spring '08 term at University of Florida.
 Spring '08
 Staff
 Probability

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