1 Sixty percent of the customers of a fast food chain order a hamburger, French fries and a drink. If a random sample of 15 cash register receipts is selected, what is the probability that less than 10 will show that the above three food items were ordered?

• 1.000
• 0.7827
• 0.9095
• 0.5968
• 0.0905

2 A machine shop has 100 drill presses and other machines in constant use. The probability that a machine will become inoperative during a given day is 0.0555. During some days no machines are inoperative, but during some days, one, two, three, or more are broken down. What is the probability that fewer than two machines will be inoperative during a particular day?

• 0.02000
• 0.01637
• 0.08187
• 0.02546

3 In a large metropolitan area, past records revealed that 30 percent of all the high school graduates go to college. From 10 graduates selected at random, calculate the probability that none will go to college.

• 0.028%
• 82%
• 28%
• 8.2%
• 2.8%

4 A marketing solutions poll of mutual funds and fund owners asked fund owners what action they took after the September 11^th2001 market drop. Sixteen percent of respondents said they bought more funds. If 600 fund owners were polled, calculate the mean and standard deviation of the number of respondents who bought more funds.

Considering as unusual a result that differs from the mean by more than two standard deviations, it (___ (is/is not) ___) unusual that in one of these polls of 600 fund owners, 100 respondents bought more mutual funds.

• 96, 9, is not
• 96, 8, is
• 96, 9, is
• 95, 8, is not
• 95, 8, is

5 (i) The proportion of the area under a normal curve to the right ofz= -1.21 is 0.8869.

(ii) The proportion of the area under a normal curve to the left ofz= 0.50 is 0.6941.

(iii) The proportion of the area under a normal curve to the left ofz= -2.10 is 0.1179.

• (i), (ii), and (iii) are all correct statements
• (i) is a correct statement but not (ii) or (iii).
• (i) and (iii) are correct statements but not (ii).
• (i) and (ii) are correct statements but not (iii).
• (ii) and (iii) are correct statements but not (i).