Unformatted text preview: 1.8974
E. .4 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Easy
Topic: Binomial 33. The equation for the variance of the binomial distribution is given by:
A. px (1  p)nx
B. np
C. np (1p)
D. AACSB: Analytical Studies
Bloom's: Application
Difficulty: Easy
Topic: Binomial 1392 Chapter 01  An Introduction to Business Statistics 34. The manager of the local grocery store has determined that, on the average, 4 customers
use the service desk every halfhour. Assume that the number of customers using the service
desk has a Poisson distribution.
What is the probability that during a randomly selected halfhour period exactly 2 customers
use the service desk?
A. .0183
B. .0733
C. .1465
D. .9084
E. .7619 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Poisson 35. The manager of the local grocery store has determined that, on the average, 4 customers
use the service desk every halfhour. Assume that the number of customers using the service
desk has a Poisson distribution.
What is the probability that during a randomly selected halfhour period no more than 2
customers use the service desk?
A. .2381
B. .1465
C. .7619
D. .8535
E. .0916 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Poisson 1393 Chapter 01  An Introduction to Business Statistics 36. The probability that a given computer chip will fail is 0.02. Find the probability that of 5
delivered chips, exactly 2 will fail.
A. .9039
B. .0922
C. .0038
D. .0000 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 37. According to a survey of adults, 64% have money in a regular savings account. If we plan
on surveying 50 randomly selected adults, find the mean number of adults who would have
regular savings accounts.
A. 12
B. 22
C. 32
D. 42 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 38. In the most recent election, 19% of all eligible college students voted. If a random sample
of 20 students were surveyed:
Find the probability that exactly half voted in the election.
A. .0000
B. .0014
C. .0148
D. .4997 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 1394 Chapter 01  An Introduction to Business Statistics 39. In the most recent election, 19% of all eligible college students voted. If a random sample
of 20 students were surveyed:
Find the probability that none of the students voted.
A. .0000
B. .0014
C. .0148
D. .4997 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 40. Of all individual tax returns, 37% include errors made by the taxpayer. If IRS examiners
are assigned randomly selected returns in batches of 12, find the mean and standard deviation
for the number of erroneous returns per batch.
A. = 2.80,
= 1.67
B. = 4.44,
= 1.67
C.
= 4.44,
= 2.80
D. = 7.56,
= 2.80 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 41. In a study conducted for the State Department of Education, 30% of the teachers who left
teaching did so because they were laid off. Assume that we randomly select 10 teachers who
have recently left their profession. Find the probability that exactly 4 of them were laid off.
A. .3000
B. .2668
C. .2001
D. .0090 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 1395 Chapter 01  An Introduction to Business Statistics 42. A company manufactures an appliance, gives a warranty and 95% of its appliances do not
require repair before the warranty expires. If an organization buys 10 of these appliances,
calculate an interval that contains 95.44% of all the appliances that won't require repair.
A. [8.12 10.88]
B. [7.43 11.57]
C. [8.81 10.19]
D. [8.55 10.45] AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 43. A manufacturer tested a sample of semiconductor chips and found that 35 were defective
and 190 were good. If additional tests are to be conducted with random samples of 160
semiconductor chips, find the mean for the number of defects in these groups of 160 (rounded
to nearest whole number).
A. 56
B. 35
C. 29
D. 25 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Discrete Probability Distribution 44. In 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:
Fewer than 4 support increased military spending
A. .0330
B. .7844
C. .9624
D. .9954 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 1396 Chapter 01  An Introduction to Business Statistics 45. In 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: Exactly 3 support increased military spending
A. .0330
B. .1318
C. .7844
D. .9624 AACSB: Analytical Studies
Bloom's: Application
Difficulty: Medium
Topic: Binomial 46. In...
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 Winter '14
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