# les4e_alq_04ac

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```Active Learning Lecture Slides
For use with Classroom Response Systems
Chapter 4: Discrete Probability Distributions
Elementary Statistics:
Picturing the World
Fourth Edition
by Larson and Farber
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 1
True or false:
The number of kittens in a litter is an
example of a discrete random variable.
A. True
B. False
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 2
True or false:
The number of kittens in a litter is an
example of a discrete random variable.
A. True
B. False
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 3
Determine the probability distributionâ€™s
missing probability value.
x
P(x)
0
1
2
3
0.25
0.30
?
0.10
A. 0.25
B. 0.65
C. 0.15
D. 0.35
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 4
Determine the probability distributionâ€™s
missing probability value.
x
P(x)
0
1
2
3
0.25
0.30
?
0.10
A. 0.25
B. 0.65
C. 0.15
D. 0.35
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 5
x represents the number of televisions in a
household:
x
P(x)
0
1
2
3
0.05
0.20
0.45
0.30
Find the mean.
A. 2
B. 1.5
C. 6
D. 0.25
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 6
x represents the number of televisions in a
household:
x
P(x)
0
1
2
3
0.05
0.20
0.45
0.30
Find the mean.
A. 2
B. 1.5
C. 6
D. 0.25
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 7
x represents the number of televisions in a
household:
x
P(x)
0
1
2
3
0.05
0.20
0.45
0.30
Find the standard deviation.
A. 1.29
B. 0.837
C. 0.146
D. 1.12
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 8
x represents the number of televisions in a
household:
x
P(x)
0
1
2
3
0.05
0.20
0.45
0.30
Find the standard deviation.
A. 1.29
B. 0.837
C. 0.146
D. 1.12
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 9
Forty-three percent of marriages end in
divorce. You randomly select 15 married
couples. Find the probability exactly 5 of
the marriages will end in divorce.
A. 0.160
B. 0.015
C. 0.039
D. 0.333
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 10
Forty-three percent of marriages end in
divorce. You randomly select 15 married
couples. Find the probability exactly 5 of
the marriages will end in divorce.
A. 0.160
B. 0.015
C. 0.039
D. 0.333
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 11
Forty-three percent of marriages end in
divorce. You randomly select 15 married
couples. Find the mean number of
marriages that will end in divorce.
A. 2.15
B. 8.55
C. 6.45
D. 2.85
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 12
Forty-three percent of marriages end in
divorce. You randomly select 15 married
couples. Find the mean number of
marriages that will end in divorce.
A. 2.15
B. 8.55
C. 6.45
D. 2.85
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 13
A fair die is rolled until a 2 appears. Find
the probability that the first 2 appears on
the fifth roll of the die.
A. 0.482
B. 0.067
C. 0.0006
D. 0.080
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 14
A fair die is rolled until a 2 appears. Find
the probability that the first 2 appears on
the fifth roll of the die.
A. 0.482
B. 0.067
C. 0.0006
D. 0.080
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 15
The mean number of customers arriving at
a bank during a 15-minute period is 10.
Find the probability that exactly 8
customers will arrive at the bank during a
15-minute period.
A. 0.0194
B. 0.1126
C. 0.0003
D. 0.0390
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 16
The mean number of customers arriving at
a bank during a 15-minute period is 10.
Find the probability that exactly 8
customers will arrive at the bank during a
15-minute period.
A. 0.0194
B. 0.1126
C. 0.0003
D. 0.0390
Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley
Slide 4- 17
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