Exam 2 Review
1.
Decide whether distributions 1 and 2 are probability distributions and answer
them in sequence.
Distribution 1
Distribution 2
x
7
6
5
4
x
3
2
8
9
P(x)
1
1/4
2/4
1/4
P(x)
.5
.4
.1
.2
a.
Yes, Yes
b.
Yes, No
c.
No, No
d.
No, Yes
2.
During the economic slowdown and financial debacle of 2007 & 2008 many
people adjusted their contributions to retirement accounts.
The data as of
September 2008 are presented in the following table:
Years of Age
<=30
30 – 45
> 45
Total
Retirement Contributor
44
41
43
128
No Contribution
32
34
23
89
Total
76
75
67
If a person is selected at random what is the probability that the person is not a
contributor?
a.
.26
b.
.41
c.
.59
d.
.74
3.
Referring to the data in Question # 2 above.
If a person is selected at random,
what is the probability that the person is a contributor
OR
>45 years of age?
1
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4.
Referring to the data in Question #2 above.
Choosing a person at random, what is
the probability that the person was not a contributor AND was <= 30?
5.
Referring to the data in Question #2 above.
Given that person is <=30, what is
the probability that the person is a contributor?
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 Spring '08
 Hossain
 Normal Distribution, Poisson Distribution, Standard Deviation, Mean, Probability theory

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