University of South Florida: QMB 6305 Quiz 2 Questions and Answers
Store sales of a large retail chain with thousands of stores tend to follow
... [Show More] a
normal distribution with a mean of 2.5 million and a standard deviation of
0.5. What percent of stores will have sales exceeding 3.5 million? about 4.5%
about 2.275% about 22.75%
about 97.725%
Answer: about 2.275%
Store sales of a large retail chain tend to follow a normal distribution with a
mean of 2.5 million and a standard deviation of 0.5. If there are a total of 4000 stores, about how many stores will have sales below 2 million?
about 91
about 635 about 3365
about 5
Answer: about 635
If z represents a standard normal random variable, what is the value of z0, such that the Probability that z is greater than z0 is 20%?
0.8416
-0.1584
0.1584
-0.8416
Answer: 0.8416
The distribution of a standard normal variable has a mean and standard
deviation, respectively, of:
1 and 1
1 and 0
0 and 1
0 and 0
Answer: 0 and 1
Store sales of a large retail chain tend to follow a normal distribution with a
mean of 2.5 million and a standard deviation of 0.5. If there are a total of 4000 stores, about how many stores will have sales between 1 and 3 million?
about 3989
about 629
about 3360
about 3365
Answer: about 3360
Suppose I define my random variable as the number of hurricanes of
category 4 or above that strike land in a given year. Suppose historically, the average number of such hurricanes striking land is 2, what is the probability that next year between 1 and 3 (including 1 and 3) number of hurricanes will strike land?
0.722
0.451
0.541
cannot be answered from the information given Answer: 0.722
Which of the following is a discrete random variable?
Normal
Poisson Standard Normal
t-Distribution Answer: Poisson
A random variable X is continuous with a normal distribution with a mean of
100 and a standard deviation of 25. What is P(X = 125)?
0
about 0.0097
about 0.8413
about 0.1587
Answer: 0
Store sales of a large retail chain tend to follow a normal distribution with a
mean of 2.5 million and a standard deviation of 0.5. If a particular store's sales are at 80th percentile, what are the sales for that store?
about 2.92 million
cannot be answered from the information given about 2.60 million
about 3.0 million Answer: about 2.92 million
Suppose I define my random variable as the number of hurricanes of
category 4 or above that strike land in a given year. Suppose historically, the average number of such hurricanes striking land is 2, what is the probability that next year 2 or more such hurricanes will strike land?
0.594
0.50
0.053
0.323
Answer: 0.594 [Show Less]