BA 101 TEST QUESTIONS AND ANSWERS LATEST UPDATE
Which of the following statements is the most accurate about a Poisson random
variable?
It counts the number of successes in a specified time or space interval.
Which of the following statements is the most accurate about a binomial random
variable?
It counts the number of successes in a given number of trials.
Chauncey Billups, a current shooting guard for the Los Angeles Clippers, has a
career free-throw percentage of 89.4%. Suppose he shoots six free throws in
tonight's game. What is the probability that Billups makes all six free throws?
0.5105
Which of the following can be represented by a continuous random variable?
The average temperature in Tampa, Florida, during the month of July
Which of the following can be represented by a discrete random variable?
The number of obtained spots when rolling a six-sided die
Which of the following can be represented by a discrete random variable?
The number of defective light bulbs in a sample of five
The expected value of a random variable X can be referred to or denoted as
___________.
All of the above
Which of the following does not represent a continuous random variable?
The number of customer arrivals to a bank between 10 am and 11 am.
A daily mail is delivered to your house between 1:00 p.m. and 5:00 p.m. Assume
delivery times follow the continuous uniform distribution. Determine the
percentage of mail deliveries that are made after 4:00 p.m.
25%
Suppose the round-trip airfare between Boston and Orlando follows the normal
probability distribution with a mean of $387.20 and a standard deviation of $68.50.
What is the probability that a randomly selected airfare between Boston and San
Francisco will be less than $300?
0.1020
Let X be normally distributed with mean μ and standard deviation σ > 0. Which of
the following is true about the z value corresponding to a given x value?
All of the above.
The time for a professor to grade a homework in statistics is normally distributed
with a mean of 12.6 minutes and a standard deviation of 2.5 minutes. What is the
probability that randomly selected homework will require more than 12 minutes to
grade?
0.5948
Find the z value such that P(Z ≤ z) = 0.9082.
.133
The probability P(Z < -1.28) is closest to _______.
.10
Which of the following statements is the most accurate about a Poisson random
variable?
It counts the number of successes in a specified time or space interval.
Which of the following statements is the most accurate about a binomial random
variable?
It counts the number of successes in a given number of trials.
Chauncey Billups, a current shooting guard for the Los Angeles Clippers, has a
career free-throw percentage of 89.4%. Suppose he shoots six free throws in
tonight's game. What is the probability that Billups makes all six free throws?
0.5105
Which of the following can be represented by a continuous random variable?
The average temperature in Tampa, Florida, during the month of July
Which of the following can be represented by a discrete random variable?
The number of obtained spots when rolling a six-sided die
Which of the following can be represented by a discrete random variable?
The number of defective light bulbs in a sample of five
The expected value of a random variable X can be referred to or denoted as
___________.
All of the above
Which of the following does not represent a continuous random variable?
The number of customer arrivals to a bank between 10 am and 11 am.
A daily mail is delivered to your house between 1:00 p.m. and 5:00 p.m. Assume
delivery times follow the continuous uniform distribution. Determine the
percentage of mail deliveries that are made after 4:00 p.m.
25%
Suppose the round-trip airfare between Boston and Orlando follows the normal
probability distribution with a mean of $387.20 and a standard deviation of $68.50.
What is the probability that a randomly selected airfare between Boston and San
Francisco will be less than $300?
0.1020
Let X be normally distributed with mean μ and standard deviation σ > 0. Which of
the following is true about the z value corresponding to a given x value?
All of the above.
The time for a professor to grade a homework in statistics is normally distributed
with a mean of 12.6 minutes and a standard deviation of 2.5 minutes. What is the
probability that randomly selected homework will require more than 12 minutes to
grade?
0.5948
Find the z value such that P(Z ≤ z) = 0.9082.
.133
The probability P(Z < -1.28) is closest to _______.
.10
