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ExamName___________________________________

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.TABLE 2-3

Every spring semester, the School of Business coordinates a luncheon with local business leaders for graduating seniors,their families, and friends. Corporate sponsorship pays for the lunches of each of the seniors, but students have to

purchase tickets to cover the cost of lunches served to guests they bring with them. The following histogram representsthe attendance at the senior luncheon, where X is the number of guests each graduating senior invited to the luncheonand f is the number of graduating seniors in each category.

1) Referring to the histogram from Table 2-3, how many graduating seniors attended the luncheon? 1) _______A) 275 B) 4 C) 388 D) 152

2) If two events are mutually exclusive, what is the probability that one or the other occurs? 2) _______A) 0

B) 0.50C) 1.00D) Cannot be determined from the information given

3) The collection of all possible events is called 3) _______A) the null set. B) a simple probability.C) a joint probability. D) a sample space.

4) The employees of a company were surveyed on questions regarding their educational background (college degree orno college degree) and marital status (single or married). Of the 600 employees, 400 had college degrees, 100 were single,and 60 were single college graduates. The probability that an employee of the company is married and has a college

degree is 4) _______A) 0.667. B) 0.833. C) 0.567. D) 0.0667.

5) For some value of Z , the value of the cumulative standardized normal distribution is 0.2090. The value of Z is 5) _______

A) -0.81. B) 0.31. C) -0.31. D) 1.96.

6) The probability that house sales will increase in the next 6 months is estimated to be 0.25. The probability that theinterest rates on housing loans will go up in the same period is estimated to be 0.74. The probability that house sales or

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interest rates will go up during the next 6 months is estimated to be 0.89. The probability that neither house sales norinterest rates will increase during the next 6 months is 6) _______

A) 0.195. B) 0.11. C) 0.89. D) 0.90.

7) If n = 10 and π = 0.70, then the standard deviation of the binomial distribution is 7) _______A) 1.45. B) 7.00. C) 14.29. D) 0.07.

8) A company has 2 machines that produce widgets. An older machine produces 23% defective widgets, while the newmachine produces only 8% defective widgets. In addition, the new machine produces 3 times as many widgets as theolder machine does. What is the probability that a randomly chosen widget produced by the company is defective? 8) _______

A) 0.310 B) 0.1175 C) 0.156 D) 0.078

9) If we know that the length of time it takes a college student to find a parking spot in the library parking lot follows anormal distribution with a mean of 3.5 minutes and a standard deviation of 1 minute, 75.8% of the college students willtake more than how many minutes when trying to find a parking spot in the library parking lot? 9) _______

A) 2.8 minutes B) 4.2 minutes C) 3.4 minutes D) 3.2 minutes

10) You have collected information on the consumption by the 15 largest coffee-consuming nations. Which of thefollowing is the best for presenting the shares of the consumption? 10) ______

A) A side-by-side bar chart B) A pie chartC) A contingency table D) A Pareto chart

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