A+ Graded Paper
QBA 775 – End Term Exam | Verified Questions &
A+ Answers & Explanations
Questions and Mark scheme
Version: Final
, .0554 - ✔✔In a binomial experiment, the probability of success is .06. What is the probability of two successes in seven
trials?
.0038 - ✔✔A production process produces 2% defective parts. A sample of five parts from the production process is
selected. What is the probability that the sample contains exactly two defective parts?
E(x) = np - ✔✔The expected value for a binomial probability distribution is
a continuous random variable - ✔✔The uniform probability distribution is used with
0.25 - ✔✔The probability density function for a uniform distribution ranging between 2 and 6 is
0.5 - ✔✔The random variable x is known to be uniformly distributed between 70 and 90. The probability of x having a
value between 80 and 95 is
The standard deviation must be 1. - ✔✔Which of the following is NOT a characteristic of the normal probability
distribution?
a mean of 0 and a standard deviation of 1 - ✔✔A standard normal distribution is a normal distribution with
the z is to the left of the mean - ✔✔For a standard normal distribution, a negative value of z indicates
.0829 - ✔✔Assume z is a standard normal random variable. Then P(1.20 ≤ z ≤ 1.85) equals
.0174 - ✔✔Assume z is a standard normal random variable. Then P(z ≥ 2.11) equals
.9190 - ✔✔Suppose x is a normally distributed random variable with a mean of 8 and a standard deviation of 4. The
probability that x is between 1.48 and 15.56 is
0.35 - ✔✔The CEO of a company wants to estimate the percent of employees that use company computers to go on
Facebook during work hours with 95% confidence. He selects a random sample of 150 of the employees and finds that
53 of them logged onto Facebook that day. What is the point estimate of the proportion of the population that logged
onto Facebook that day?
QBA 775 – End Term Exam | Verified Questions &
A+ Answers & Explanations
Questions and Mark scheme
Version: Final
, .0554 - ✔✔In a binomial experiment, the probability of success is .06. What is the probability of two successes in seven
trials?
.0038 - ✔✔A production process produces 2% defective parts. A sample of five parts from the production process is
selected. What is the probability that the sample contains exactly two defective parts?
E(x) = np - ✔✔The expected value for a binomial probability distribution is
a continuous random variable - ✔✔The uniform probability distribution is used with
0.25 - ✔✔The probability density function for a uniform distribution ranging between 2 and 6 is
0.5 - ✔✔The random variable x is known to be uniformly distributed between 70 and 90. The probability of x having a
value between 80 and 95 is
The standard deviation must be 1. - ✔✔Which of the following is NOT a characteristic of the normal probability
distribution?
a mean of 0 and a standard deviation of 1 - ✔✔A standard normal distribution is a normal distribution with
the z is to the left of the mean - ✔✔For a standard normal distribution, a negative value of z indicates
.0829 - ✔✔Assume z is a standard normal random variable. Then P(1.20 ≤ z ≤ 1.85) equals
.0174 - ✔✔Assume z is a standard normal random variable. Then P(z ≥ 2.11) equals
.9190 - ✔✔Suppose x is a normally distributed random variable with a mean of 8 and a standard deviation of 4. The
probability that x is between 1.48 and 15.56 is
0.35 - ✔✔The CEO of a company wants to estimate the percent of employees that use company computers to go on
Facebook during work hours with 95% confidence. He selects a random sample of 150 of the employees and finds that
53 of them logged onto Facebook that day. What is the point estimate of the proportion of the population that logged
onto Facebook that day?
