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ECO 3401
Unit 3 Practice Exam
Name___________________________________
MULTIPLE CHOICE.
Choose the one alternative that best completes the statement or answers the question.
Write the sample space for the given experiment.
1) A coin is tossed, and then a die is rolled.
1)
A) {(h, 1), (h, 2), (h, 3), (h, 4), (h, 5), (h, 6), (t, 1), (t, 2), (t, 3), (t, 4), (t, 5), (t, 6)}
B) {(2, 6)}
C) {(h, t, 1, 2, 3, 4, 5, 6)}
D) {(1, h), (2, h), (3, h), (4, h), (5, h), (6, h), (1, t), (2, t), (3, t), (4, t), (5, t), (6, t)}
2) A card is selected at random from a deck and its suit is recorded. Then a coin is tossed.
2)
A) {(head, spade), (head, club), (head, heart), (head, diamond), (tail, spade), (tail, club), (tail,
heart), (tail, diamond)}
B) {(4, 2)}
C) {(spade, head), (club, head), (heart, head), (diamond, head), (spade, tail), (club, tail), (heart,
tail), (diamond, tail)}
D) {(club, diamond, heart, spade, head, tail)}
Find the indicated probability.
3)
The distribution of B.A. degrees conferred by a local college is listed below, by major.
Major
Frequency
English
2073
Mathematics
2164
Chemistry
318
Physics
856
Liberal Arts
1358
Business
1676
Engineering
868
9313
What is the probability that a randomly selected degree is in Engineering?
3)
A) 868
B) 0.0012
C) 0.1028
D) 0.0932
4) Find the probability that a number less than 5 is obtained when a fair die is rolled.
4)
A)
1
2
B)
5
6
C)
2
3
D) 0
Find the indicated probability.
5) If P(A
1
B)
=
0.65, P(A)
=
0.34, and P(B)
=
0.48, find P(A
.
B).
5)
A) 0.58
B) 0.17
C) 0.29
D) 0.13
1
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6) A poll is conducted in a U.S. city to determine voting preferences prior to a presidential election.
The following probabilities were obtained
from the relative frequencies:
P(D)
=
0.51, P(M)
=
0.48, P(M
.
D)
=
0.36
where M represents male and D represents a person who plans to vote Democrat.
Find P(M
1
D).
6)
A) 0.63
B) 0.78
C) 0.71
D) 0.49
7) 44% of a store's computers come from factory A and the remainder come from factory B. 2% of
computers from factory A are defective while 4% of computers from factory B are defective. If one
of the store's computers is selected at random, what is the probability that it is defective and from
factory A?
7)
A) 0.009
B) 0.98
C) 0.980
D) 0.431
Use the given table to find the indicated probability.
8)
People in a survey were given three choices of soft drinks and asked to choose one favorite. The
following table shows the results.
cola
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 Fall '08
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