# Liberty BUSI 230 Exam 2 Answers Complete Solutions

You would just need to put your values into excel. I put all mathematical formulas. They are the same questions with different values.

For any distribution, what is the z-score corresponding to the mean?

What is the probability of randomly selecting a z-score less than z = −0.80 from a normal distribution?

Which of the following is not a continuous variable?

## STATUS

A normal distribution has a mean of μ = 80 with σ = 12. Find the following probabilities.

Any score with a value less than the population mean will have a negative z-score.

For a population with μ = 90 and σ = 25, find the z-score corresponding to each of the following X values.

If a binomial distribution has p = .30, then q = ____.

Consider the following two events for an individual.

A = owns a cell phone

B = owns a laptop computer

Translate each event into words.

(a) Ac

Answer

(b) A and B

Answer

(c) A or B

Answer

(d) A | B

Answer

(e) B | A

Does it pay to ask for a raise? A national survey of heads of households showed the percentage of those who asked for a raise and the percentage who got one. According to the survey, of the women interviewed, 22% had asked for a raise, and of those women who had asked for a raise, 45% received the raise. If a woman is selected at random from the survey population of women, find the following probabilities. (Enter your answers to three decimal places.)

(a) P(woman asked for a raise)

Answer

(b) P(woman received raise, given she asked for one)

Answer

(c) P(woman asked for raise and received raise)

Thickness measurements of ancient prehistoric Native American pot shards discovered in a Hopi village are approximately normally distributed, with a mean of 4.5 millimeters (mm) and a standard deviation of 0.9 mm. For a randomly found shard, find the following probabilities. (Round your answers to four decimal places.)

(a) the thickness is less than 3.0 mm

(b) the thickness is more than 7.0 mm

(c) the thickness is between 3.0 mm and 7.0 mm

When do creative people get their best ideas? USA Today did a survey of 966 inventors (who hold U.S. patents) and obtained the following information.

(a) Assuming that the time interval includes the left limit and all the times up to but not including the right limit, estimate the probability that an inventor has a best idea during each time interval: from 6 A.M. to 12 noon, from 12 noon to 6 P.M., from 6 P.M. to 12 midnight, from 12 midnight to 6 A.M. (Enter your answers to 3 decimal places.)

(b) Do the probabilities add up to 1? Why should they?

What is the sample space in this problem?

During the Computer Daze special promotion, a customer purchasing a computer and printer is given a choice of seven free software packages. There are 10 different software packages from which to select. How many different groups of software packages can be selected?