Question 1
2 out of 2 points
The number of customers that enter a store during one day is an example of
Answer
Selected Answer:
a discrete random variable
Question 2
2 out of 2 points
Exhibit 56
Probability Distribution
x
f(x)
10
.2
20
.3
30
.4
40
.1
Refer to Exhibit 56. The variance of x equals
Answer
Selected Answer:
84
Question 3
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2 out of 2 points
The expected value for a binomial probability distribution is
Answer
Selected Answer:
E(x) = np
Question 4
2 out of 2 points
Which of the following is not a characteristic of an experiment where the binomial probability
distribution is applicable?
Answer
Selected Answer:
the trials are dependent
Question 5
2 out of 2 points
Exhibit 511
The random variable x is the number of occurrences of an event over an interval of ten minutes.
It can be assumed that the probability of an occurrence is the same in any two time periods of an
equal length. It is known that the mean number of occurrences in ten minutes is 5.3.
Refer to Exhibit 511. The probability that there are 8 occurrences in ten minutes is
Answer
Selected Answer:
.0771
Question 6
2 out of 2 points
Exhibit 53
The probability distribution for the number of goals the Lions soccer team makes per game is
given below.
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 Spring '12
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 Business, Probability theory, Discrete probability distribution

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