Unformatted text preview: plication
Difficulty: Medium
Topic: Normal Distribution 66. If x is a binomial random variable where n = 100 and p = .1, find the probability that x is
less than or equal to 10 using the normal approximation to the binomial.
A. .9544
B. .0446
C. .5675
D. .4325 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial  Normal Approximation 1494 Chapter 01  An Introduction to Business Statistics 67. What is the probability that a random variable having a standard normal distribution is
between .87 and 1.28?
A. .0919
B. .4100
C. .6517
D. .3483 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Normal Distribution 68. The probability that an appliance is in repair is .5. If an apartment complex has 100 such
appliances, what is the probability that at least 60 will be in repair? Use the normal
approximation to the binomial.
A. .5000
B. .0287
C. .6000
D. .9713 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial  Normal Approximation 1495 Chapter 01  An Introduction to Business Statistics 69. The flying time of a drone airplane has a normal distribution with mean 4.76 hours and
standard deviation of .04 hours. What is the probability that the drone will fly:
Less than 4.66 hours?
A. .0062
B. .5062
C. .0062
D. .9938 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Normal Distribution 70. The flying time of a drone airplane has a normal distribution with mean 4.76 hours and
standard deviation of .04 hours. What is the probability that the drone will fly:
More than 4.80 hours?
A. .1587
B. .8413
C. .6587
D. /3413 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Normal Distribution 1496 Chapter 01  An Introduction to Business Statistics 71. The flying time of a drone airplane has a normal distribution with mean 4.76 hours and
standard deviation of .04 hours. What is the probability that the drone will fly:
Between 4.70 and 4.82 hours?
A. .1336
B. .8664
C. .9332
D. .4332 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Normal Distribution 72. What is the probability that a standard normal random variable will be between 2 and 2?
A. .4772
B. .0228
C. .9772
D. .9544 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Normal Distribution 1497 Chapter 01  An Introduction to Business Statistics 73. What is the probability that a standard normal random variable will be between .3 and
3.2?
A. .6179
B. .3808
C. .6192
D. .9987 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Normal Distribution 74. The life of a light bulb is exponentially distributed with a mean of 1,000 hours. What is
the probability that the bulb will last:
More than 1,200 hours?
A. .3012
B. .3679
C. .4345
D. .6988 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Hard
Topic: Exponential Distribution 1498 Chapter 01  An Introduction to Business Statistics 75. The life of a light bulb is exponentially distributed with a mean of 1,000 hours. What is
the probability that the bulb will last:
Less than 800 hours?
A. .6321
B. .5507
C. .7135
D. .4493 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Exponential Distribution 76. The lifetime of a stereo component is exponentially distributed with mean 1,000 days.
What is the probability that the lifetime:
Exceeds 1,000 days?
A. .6321
B. .5000
C. .3679
D. 1.000 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Exponential Distribution 1499 Chapter 01  An Introduction to Business Statistics 77. The lifetime of a stereo component is exponentially distributed with mean 1,000 days.
What is the probability that the lifetime:
Is greater than or equal to 700 days?
A. .7603
B. .5034
C. .2397
D. .4966 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Hard
Topic: Exponential Distribution 78. The time between breakdowns of an alarm system is exponentially distributed with mean
10 days. What is the probability that there are no breakdowns on a given day?
A. .9048
B. .3679
C. .0952
D. 0.000 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Hard
Topic: Exponential Distribution 1500 Chapter 01  An Introduction to Business Statistics 79. An aptitude test has a mean score of 80 and a standard deviation of 5. The population of
scores is normally distributed. What proportion of tests has scores over 90?
A. .9772
B. .0228
C. .9544
D. .0456 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Normal Distribution 80. An aptitude test has a mean score of 80 and a standard deviation of 5. The population of
scores is normally distributed. What raw score corresponds to the 70th percentile?
A. 77.4
B. 83.5
C. 82.6
D. 76.5 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Hard
Topic: Normal Distribution 1501 Chapter 01  An Introduction to Business Statistics 81. Suppose the daily change in price of a stock is normally distributed with m...
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 Winter '14
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