21. The volume of liquid in an unopened 1-litre can of paint is an example of ___.
a) the binomial distribution
b) the normal distribution
c) a continuous random variable
d) a discrete random variable
e) a constant
...
21. The volume of liquid in an unopened 1-litre can of paint is an example of ___.
a) the binomial distribution
b) the normal distribution
c) a continuous random variable
d) a discrete random variable
e) a constant
Answer: c
22. The number of defective parts in a lot of 25 parts is an example of ___.
a) a discrete random variable
b) a continuous random variable
c) the Poisson distribution
d) the normal distribution
e) a constant
Answer: a
23. You are offered an investment opportunity. Its outcomes and probabilities are presented in
the following table:
x x)
-$1,000 .40
$0 .20
+$1,000 .40
The mean of this distribution is ___.
a) -$400
b) $0
c) $200
d) $400
e) $500
Answer: b
24. You are offered an investment opportunity. Its outcomes and probabilities are presented in
the following table:
x x)
-$1,000 .40
$0 .20
+$1,000 .40
The standard deviation of this distribution is ___.
a) -$400
b) $663
c) $800,000
d) $894
e) $2000
Answer: d
25. You are offered an investment opportunity. Its outcomes and probabilities are presented in
the following table:
x x)
-$1,000 .40
$0 .20
+$1,000 .40
Which of the following statements is true?
a) This distribution is skewed to the right.
b) This is a binomial distribution.
c) This distribution is symmetric.
d) This distribution is skewed to the left.
e) This is a Poisson distribution
Answer: c
26. A market research team compiled the following discrete probability distribution. In this
distribution x represents the number of automobiles owned by a family.
P(x)
0.10
0.10
0.50
0.30
The mean (average) value of x is ___.
a) 1.0
b) 1.5
c) 2.0
d) 2.5
e) 3.0
Answer: c
27. A market research team compiled the following discrete probability distribution. In this
distribution x represents the number of automobiles owned by a family.
The standard deviation of x is ___.
a) 0.80
b) 0.89
c) 1.00
d) 2.00
e) 2.25
Answer: b
28. A market research team compiled the following discrete probability distribution. In this
distribution x represents the number of automobiles owned by a family.
P(x)
0.10
0.10
0.50
0.30
Which of the following statements is true?
a) This distribution is skewed to the right.
b) This is a binomial distribution.
c) This is a normal distribution.
d) This distribution is skewed to the left.
e) This distribution is bimodal.
Answer: d
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