Probability Exam Worksheet With Answer Key - Math 211, Eastern Mediterranean University Page 19
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34114) A group of students were asked if they carry a credit card. The responses are listed in the table.
114)
Credit Card
Not a Credit Card
Class
Carrier
Carrier
Total
Freshman
21
39
60
Sophomore
15
25
40
Total
36
64
100
If a student is selected at random, find the probability that he or she is a sophomore given that the
student owns a credit card. Round your answers to three decimal places.
A) 0.583
B) 0.417
C) 0.150
D) 0.900
115) A group of students were asked if they carry a credit card. The responses are listed in the table.
115)
Credit Card
Not a Credit Card
Class
Carrier
Carrier
Total
Freshman
10
50
60
Sophomore
20
20
40
Total
30
70
100
If a student is selected at random, find the probability that he or she is a sophomore and owns a
credit card. Round your answers to three decimal places.
A) 0.667
B) 0.200
C) 0.750
D) 0.333
116) You are dealt two cards successively without replacement from a standard deck of 52 playing
116)
cards. Find the probability that the first card is a two and the second card is a ten. Round your
answer to three decimal places.
A) 0.500
B) 0.994
C) 0.250
D) 0.006
117) Find the probability of answering two true or false questions correctly if random guesses are made.
117)
Only one of the choices is correct.
A) 0.75
B) 0.25
C) 0.5
D) 0.1
118) Find the probability of answering the two multiple choice questions correctly if random guesses
118)
are made. Assume the questions each have five choices for the answer. Only one of the choices is
correct.
A) 0.04
B) 0.02
C) 0.004
D) 0.4
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
119) Find the probability of getting four consecutive aces when four cards are drawn without
119)
replacement from a standard deck of 52 playing cards.
120) Find the probability of selecting two consecutive threes when two cards are drawn
120)
without replacement from a standard deck of 52 playing cards. Round your answer to
four decimal places.
19
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