Question 1

Excel's __________ function can be used to compute the expected value of a discrete random variable.

Accepted Answer

A) SUMPRODUCT 
B) AVERAGE 
C) MEDIAN 
D) VAR

Question 2

Exhibit 5-7
A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information. 
-Refer to Exhibit 5-7. The variance of the number of cups of coffee is

Accepted Answer

A) .96 
B) .9798 
C) 1 
D) 2.4

Question 3

A property of the Poisson distribution is that the mean equals the

Accepted Answer

A) mode 
B) median 
C) variance 
D) standard deviation

Question 4

Excel's HYPGEOM.DIST function can be used to compute

Accepted Answer

A) bin width for histograms 
B) hypergeometric probabilities 
C) cumulative hypergeometric probabilities 
D) Both hypergeometric probabilities and cumulative hypergeometric probabilities are correct.

Question 5

Exhibit 5-10
The probability that Pete will catch fish on a particular day when he goes fishing is 0.8. Pete is going fishing 3 days next week.
-Refer to Exhibit 5-10. The expected number of days Pete will catch fish is

Accepted Answer

A) .6 
B) .8 
C) 2.4 
D) 3

Question 6

The standard deviation is the

Accepted Answer

A) variance squared 
B) square root of the sum of the deviations from the mean 
C) same as the expected value 
D) positive square root of the variance

Question 7

Exhibit 5-10
The probability that Pete will catch fish on a particular day when he goes fishing is 0.8. Pete is going fishing 3 days next week.
-When dealing with the number of occurrences of an event over a specified interval of time or space and when the occurrence or nonoccurrence in any interval is independent of the occurrence or nonoccurrence in any other interval, the appropriate probability distribution is a

Accepted Answer

A) binomial distribution 
B) Poisson distribution 
C) normal distribution 
D) hypergeometric probability distribution

Question 8

Exhibit 5-10
The probability that Pete will catch fish on a particular day when he goes fishing is 0.8. Pete is going fishing 3 days next week.
-Refer to Exhibit 5-10. The probability that Pete will catch fish on exactly one day is

Accepted Answer

A) .008 
B) .096 
C) .104 
D) .8

Question 9

Exhibit 5-7
A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information. 
-In a binomial experiment the probability of success is 0.06. What is the probability of two successes in seven trials?

Accepted Answer

A) 0.0036 
B) 0.06 
C) 0.0554 
D) 0.28

Question 10

During lunchtime, customers arrive at Bob's Drugs according to a Poisson distribution with $\lambda$ = 4 per minute.
a. During a one minute interval, determine the following probabilities: (1) no arrivals; (2) one arrival; (3) two arrivals; and, (4) three or more arrivals.
b. What is the probability of two arrivals in a two-minute period?

Accepted Answer

The answer of During lunchtime, customers arrive at Bob's Drugs...

Question 11

Compute the hypergeometric probabilities for the following values of n and x. Assume N = 8 and r = 5.
a.n = 5, x = 2
b.n = 6, x = 4
c.n = 3, x = 0
d.n = 3, x = 3

Accepted Answer

The answer of Compute the hypergeometric probabilities for the following...

Question 12

Exhibit 5-7
A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information. 
-A probability distribution showing the probability of x successes in n trials, where the probability of success does not change from trial to trial, is termed a

Accepted Answer

A) uniform probability distribution 
B) binomial probability distribution 
C) hypergeometric probability distribution 
D) normal probability distribution

Question 13

Exhibit 5-7
A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information. 
-If you are conducting an experiment where the probability of a success is .02 and you are interested in the probability of 4 successes in 15 trials, the correct probability function to use is the

Accepted Answer

A) standard normal probability density function 
B) normal probability density function 
C) Poisson probability function 
D) binomial probability function

Question 14

Exhibit 5-10
The probability that Pete will catch fish on a particular day when he goes fishing is 0.8. Pete is going fishing 3 days next week.
-In the textile industry, a manufacturer is interested in the number of blemishes or flaws occurring in each 100 feet of material. The probability distribution that has the greatest chance of applying to this situation is the

Accepted Answer

A) normal distribution 
B) binomial distribution 
C) Poisson distribution 
D) uniform distribution

Question 15

In a large university, 15% of the students are female. If a random sample of twenty students is selected,
a. what is the probability that the sample contains exactly four female students?
b. what is the probability that the sample will contain no female students?
c. what is the probability that the sample will contain exactly twenty female students?
d. what is the probability that the sample will contain more than nine female students?
e. what is the probability that the sample will contain fewer than five female students?
f. what is the expected number of female students?

Accepted Answer

The answer of In a large university, 15% of the...

Question 16

Exhibit 5-10
The probability that Pete will catch fish on a particular day when he goes fishing is 0.8. Pete is going fishing 3 days next week.
-The Poisson probability distribution is a

Accepted Answer

A) continuous probability distribution 
B) discrete probability distribution 
C) uniform probability distribution 
D) normal probability distribution

Question 17

The _____ probability function is based in part on the counting rule for combinations.

Accepted Answer

A) binomial 
B) Poisson 
C) hypergeometric 
D) exponential

Question 18

Twenty percent of the students in a class of 100 are planning to go to graduate school. The standard deviation of this binomial distribution is

Accepted Answer

A) 20 
B) 16 
C) 4 
D) 2

Question 19

Shoppers enter Hamilton Place Mall at an average of 120 per hour.
a.Define the random variable in words for this experiment.
b.What is the probability that exactly 5 shoppers will enter the mall between noon and 1:00 p.m.?
c.What is the probability that exactly 5 shoppers will enter the mall between noon and 12:05 p.m.?
d.What is the probability that at least 35 shoppers will enter the mall between 5:00 and 5:10 p.m.?

Accepted Answer

The answer of Shoppers enter Hamilton Place Mall at an...

Question 20

Exhibit 5-2
The probability distribution for the daily sales at Michael's Co. is given below. 
-Refer to Exhibit 5-2. The expected daily sales are

Accepted Answer

A) $55,000 
B) $56,000 
C) $50,000 
D) $70,000

Exam 5: Discrete Probability Distributions

Excel's __________ function can be used to compute the expected value of a discrete random variable.

Exhibit 5-7 A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information. -Refer to Exhibit 5-7. The variance of the number of cups of coffee is

A property of the Poisson distribution is that the mean equals the

Excel's HYPGEOM.DIST function can be used to compute

Exhibit 5-10 The probability that Pete will catch fish on a particular day when he goes fishing is 0.8. Pete is going fishing 3 days next week. -Refer to Exhibit 5-10. The expected number of days Pete will catch fish is

The standard deviation is the

Exhibit 5-10 The probability that Pete will catch fish on a particular day when he goes fishing is 0.8. Pete is going fishing 3 days next week. -Refer to Exhibit 5-10. The probability that Pete will catch fish on exactly one day is

Exhibit 5-7 A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information. -In a binomial experiment the probability of success is 0.06. What is the probability of two successes in seven trials?

Compute the hypergeometric probabilities for the following values of n and x. Assume N = 8 and r = 5. a.n = 5, x = 2 b.n = 6, x = 4 c.n = 3, x = 0 d.n = 3, x = 3

Exhibit 5-10 The probability that Pete will catch fish on a particular day when he goes fishing is 0.8. Pete is going fishing 3 days next week. -The Poisson probability distribution is a

The _____ probability function is based in part on the counting rule for combinations.

Twenty percent of the students in a class of 100 are planning to go to graduate school. The standard deviation of this binomial distribution is

Exhibit 5-2 The probability distribution for the daily sales at Michael's Co. is given below. -Refer to Exhibit 5-2. The expected daily sales are