AP Stat Unit 4 Progress Check: MCQ Part
C, Ap stats Exam Questions And Answers
A thumbtack that is tossed can land point up or point down. The
probability of a tack landing point up is 0.2. A simulation was
conducted in which a trial consisted of tossing 5 thumbtacks and
recording the number of thumbtacks that land point up. Many trials
of the simulation were conducted and the results are shown in the
histogram.
Based on the results of the simulation, which of the following is
closest to the probability that at least 2 thumbtacks land pointing
up when 5 thumbtacks are tossed? -
correct answer 0.28
According to a 2018 survey, 74 percent of employed young adults
expect to bring work on a vacation trip. A random sample of 20
employed young adults will be selected. What is the probability
that 8 of the selected young adults will expect to bring work on a
vacation trip? -
correct answer (20/8)(0.74)^8(0.26)^12
In the United States, 75 percent of adults wear glasses or contact
lenses. A random sample of 10 adults in the United States will be
selected. Which of the following is closest to the probability that
fewer than 8 of the selected adults wear glasses or contact lenses?
,AP Stat Unit 4 Progress Check: MCQ Part
C, Ap stats Exam Questions And Answers
-
correct answer 0.47
According to a 2016 survey, 6 percent of workers arrive to work
between 6:45 A.M. and 7:00 A.M. Suppose 300 workers will be
selected at random from all workers in 2016. Let the random
variable W represent the number of workers in the sample who
arrive to work between 6:45 A.M. and 7:00 A.M. Assuming the
arrival times of workers are independent, which of the following is
closest to the standard deviation of W ? -
correct answer 4.11
In the United States, the generation of people born between 1946
and 1964 are known as baby boomers, and the generation of
people born between 1981 and 1996 are known as millennials.
Currently, 18 percent of the population are baby boomers and 27
percent of the population are millennials. A random sample of 500
people will be selected. Let the random variable B represent the
number of baby boomers in the sample, and let the random
variable M represent the number of millennials in the sample. By
how much will the mean of M exceed the mean of B ? -
correct answer 45
,AP Stat Unit 4 Progress Check: MCQ Part
C, Ap stats Exam Questions And Answers
According to a 2015 Census Bureau survey, 75,511 of the 822,959
residents of Baltimore County, Maryland, were enrolled in college.
Consider a sample of 800 residents of Baltimore County, Maryland
in 2015 selected at random. Which of the following is closest to the
expected value of the number in the sample enrolled in college? -
correct answer 73.4
During a severe storm, electrical transformers that function
independently are expected to operate 85 percent of the time.
Suppose 20 electrical transformers are randomly selected from the
population. Let the random variable T represent the number of
electrical transformers operating during a severe storm. Which of
the following is the best interpretation of the random variable T ? -
correct answer It is a binomial variable with mean 17
transformers and standard deviation 2.55√2.55 transformers.
A random sample of n people selected from a large population will
be asked whether they have read a novel in the past year. Let the
random variable R represent the number of people from the
sample who answer yes. The variance of random variable R is 6.
Assume the responses are independent of each other. If the
proportion of people from the population who read a novel in the
past year is 0.40, which of the following is the best interpretation of
, AP Stat Unit 4 Progress Check: MCQ Part
C, Ap stats Exam Questions And Answers
random variable R ? -
correct answer A binomial variable with 25 independent trials
A local department store estimates that 10 percent of its customers
return the merchandise they purchase. Let the random variable R
represent the number of returns for a random sample of 40
customers. Assume that random variable R follows a binomial
distribution. What is described by the value of
(40/8)(0.1)^8(0.9)^32? -
correct answer The probability that 8 customers in the sample
will return merchandise
Past records indicate that 15 percent of the flights for a certain
airline are delayed. Suppose flights are randomly selected one at a
time from all flights. Assume each selection is independent of
another. Which of the following is closest to the probability that it
will take 5 selections to find one flight that is delayed? -
correct answer 0.0783
A representative from a company that manufactures items for left-
handed people will attend a large convention. The representative
hopes to find a left-handed person at the convention to try out the
items. The representative will select an attendee at random until a
C, Ap stats Exam Questions And Answers
A thumbtack that is tossed can land point up or point down. The
probability of a tack landing point up is 0.2. A simulation was
conducted in which a trial consisted of tossing 5 thumbtacks and
recording the number of thumbtacks that land point up. Many trials
of the simulation were conducted and the results are shown in the
histogram.
Based on the results of the simulation, which of the following is
closest to the probability that at least 2 thumbtacks land pointing
up when 5 thumbtacks are tossed? -
correct answer 0.28
According to a 2018 survey, 74 percent of employed young adults
expect to bring work on a vacation trip. A random sample of 20
employed young adults will be selected. What is the probability
that 8 of the selected young adults will expect to bring work on a
vacation trip? -
correct answer (20/8)(0.74)^8(0.26)^12
In the United States, 75 percent of adults wear glasses or contact
lenses. A random sample of 10 adults in the United States will be
selected. Which of the following is closest to the probability that
fewer than 8 of the selected adults wear glasses or contact lenses?
,AP Stat Unit 4 Progress Check: MCQ Part
C, Ap stats Exam Questions And Answers
-
correct answer 0.47
According to a 2016 survey, 6 percent of workers arrive to work
between 6:45 A.M. and 7:00 A.M. Suppose 300 workers will be
selected at random from all workers in 2016. Let the random
variable W represent the number of workers in the sample who
arrive to work between 6:45 A.M. and 7:00 A.M. Assuming the
arrival times of workers are independent, which of the following is
closest to the standard deviation of W ? -
correct answer 4.11
In the United States, the generation of people born between 1946
and 1964 are known as baby boomers, and the generation of
people born between 1981 and 1996 are known as millennials.
Currently, 18 percent of the population are baby boomers and 27
percent of the population are millennials. A random sample of 500
people will be selected. Let the random variable B represent the
number of baby boomers in the sample, and let the random
variable M represent the number of millennials in the sample. By
how much will the mean of M exceed the mean of B ? -
correct answer 45
,AP Stat Unit 4 Progress Check: MCQ Part
C, Ap stats Exam Questions And Answers
According to a 2015 Census Bureau survey, 75,511 of the 822,959
residents of Baltimore County, Maryland, were enrolled in college.
Consider a sample of 800 residents of Baltimore County, Maryland
in 2015 selected at random. Which of the following is closest to the
expected value of the number in the sample enrolled in college? -
correct answer 73.4
During a severe storm, electrical transformers that function
independently are expected to operate 85 percent of the time.
Suppose 20 electrical transformers are randomly selected from the
population. Let the random variable T represent the number of
electrical transformers operating during a severe storm. Which of
the following is the best interpretation of the random variable T ? -
correct answer It is a binomial variable with mean 17
transformers and standard deviation 2.55√2.55 transformers.
A random sample of n people selected from a large population will
be asked whether they have read a novel in the past year. Let the
random variable R represent the number of people from the
sample who answer yes. The variance of random variable R is 6.
Assume the responses are independent of each other. If the
proportion of people from the population who read a novel in the
past year is 0.40, which of the following is the best interpretation of
, AP Stat Unit 4 Progress Check: MCQ Part
C, Ap stats Exam Questions And Answers
random variable R ? -
correct answer A binomial variable with 25 independent trials
A local department store estimates that 10 percent of its customers
return the merchandise they purchase. Let the random variable R
represent the number of returns for a random sample of 40
customers. Assume that random variable R follows a binomial
distribution. What is described by the value of
(40/8)(0.1)^8(0.9)^32? -
correct answer The probability that 8 customers in the sample
will return merchandise
Past records indicate that 15 percent of the flights for a certain
airline are delayed. Suppose flights are randomly selected one at a
time from all flights. Assume each selection is independent of
another. Which of the following is closest to the probability that it
will take 5 selections to find one flight that is delayed? -
correct answer 0.0783
A representative from a company that manufactures items for left-
handed people will attend a large convention. The representative
hopes to find a left-handed person at the convention to try out the
items. The representative will select an attendee at random until a
