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Unformatted text preview: a study conducted by UCLA, it was found that 25% of college freshmen support
increased military spending. If 6 college freshmen are randomly selected, find the probability
that: Only 1 support increased military spending
A. .0330
B. .1318
C. .3560
D. .7844 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 47. A multiplechoice test has 30 questions and each one has five possible answers, of which
one is correct. If all answers were guesses, find the probability of getting exactly four correct
answers.
A. .0604
B. .1325
C. .2552
D. .8000 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Discrete Probability Distribution 1397 Chapter 01  An Introduction to Business Statistics 48. It is known that 15% of all college freshmen at Ivey University leave after their first year.
Calculate the interval that contains 99.73% of the students who remain if we are looking at a
random sample of 300 Ivey University freshmen.
A. [236.45 273.55]
B. [26.45 63.55]
C. [110.25 369.75]
D. [38.82 51.18] AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 49. The variable "employment status" which can take on one of two values: 1 for "employed"
and 0 for "unemployed" is an example of a _____________ random variable.
A. Poisson
B. Discrete
C. Hypergeometric
D. Continuous AACSB: Reflective Thinking
Bloom's: Knowledge
Difficulty: Medium
Topic: Discrete Random Variable 50. If x is a binomial random variable, then the standard deviation of x is given by
A. np
B. (npq)2
C. √npq
D. npq AACSB: Analytical Studies
Bloom's: Knowledge
Difficulty: Medium
Topic: Binomial 1398 Chapter 01  An Introduction to Business Statistics 51. A random variable that is defined to be the total number of successes in n trials is a _____
random variable.
A. Binomial
B. Poisson
C. Hypergeometric
D. Continuous AACSB: Reflective Thinking
Bloom's: Knowledge
Difficulty: Medium
Topic: Binomial 52. A discrete variable that can often be used to describe the number of occurrences of an
event over a specified interval of time or space is a _____ random variable.
A. Poisson
B. Discrete
C. Hypergeometric
D. Continuous AACSB: Reflective Thinking
Bloom's: Knowledge
Difficulty: Medium
Topic: Poisson 53. The requirement that the probability of success remains constant from trial to trial is a
property of the _______________ distribution.
A. Binomial
B. Poisson
C. Hypergeometric
D. Continuous AACSB: Reflective Thinking
Bloom's: Knowledge
Difficulty: Medium
Topic: Binomial 1399 Chapter 01  An Introduction to Business Statistics 54. The distribution whose mean is equal to its variance is the _________ distribution.
A. Binomial
B. Poisson
C. Hypergeometric
D. Continuous AACSB: Reflective Thinking
Bloom's: Knowledge
Difficulty: Easy
Topic: Poisson 55. For a random variable X, the mean value of the squared deviations of its values from their
expected value is called its
A. Standard Deviation
B. Mean
C. Probability
D. Variance AACSB: Reflective Thinking
Bloom's: Knowledge
Difficulty: Hard
Topic: Discrete Random Variable 56. The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a
defective calculator is 10%.
If 3 calculators are selected at random, what is the probability that one of the calculators will
be defective?
A. .0702
B. .0010
C. .2430
D. .7290 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 1400 Chapter 01  An Introduction to Business Statistics 57. The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a
defective calculator is 10%.
If 10 calculators are selected at random, what is the probability that 3 or more of the
calculators will be defective?
A. .0702
B. .2639
C. .0016
D. 0
P(X ≥ 3) = 1  P(X ≤ 2) = 1  .9298 = .0702 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 58. The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a
defective calculator is 10%.
If 100 calculators are selected at random, what is the expected number of defectives?
A. 9
B. 90
C. 10
D. 95 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 1401 Chapter 01  An Introduction to Business Statistics 59. The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a
defective calculator is 10%.
If 100 calculators are selected at random, what is the standard deviation of the number of
defectives?
A. 9.00
B. 3.17
C. 9.49
D. 3.00 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 60. Historical data shows that the average number of patient arrivals at the intensive care unit
of General Hospital is 3 patients every 2 hours. Assume that the patient arrivals are distributed
according to Poisson distribution.
Determine the probability of 6 patients arriving in a fivehour period.
A. .136
B. .109
C. .246
D. .001 AACSB: Analytical Studies
Bloom's: Application...
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 Winter '14

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