1 1. In an office, there are seven women and three men. If one person is selected, find the probability that the person is a woman. a 1/7 . b 3/1 . 0 c 7/1 . 0 d 1/3 . QUESTION 2 1. A grocery store employs cashiers, stock clerks, and deli personnel. The distribution of employees according to marital status is shown below: Marital Status 2. Cashie Stock rs Clerks Deli Personnel Married 8 12 3 Not Married 5 15 2 If an employee is selected at random, find the probability that the employee is a stock clerk or married. a 10/9 . b 2/3 . c 38/4 . 5 d 7/9 . QUESTION 3 1. A flashlight has five batteries, three of which are defective. If two are selected at random without replacement, find the probability that both are defective. a 1/1 . 0 b 3/2 . 8 1/3 2 d 3/1 . 0 c . 7 points QUESTION 4 1. In a large shopping mall, a marketing agency conducted a survey on credit cards. The results are shown in the following table: Employment Status Owns a Credit Card Does Not Own a Credit Card Employed 18 29 Unemployed 28 34 If a person is selected at random, find the probability that the person owns a credit card, given that the person is employed. a 9/23 . b 18/4 . 7 14/2 3 d 7/31 c . . 7 points 1. QUESTION 5 A lot of portable radios contains five good radios and two defective ones. If two are selected and tested, find the probability that at least one will be defective. a 2/5 . b 3/4 . c 5/7 . d 11/2 . 1 7 points QUESTION 6 1. The speed of a car is considered a continuous variable. a Tru . e b Fals . e 7 points 1. QUESTION 7 The number of cups of coffee a fast-food restaurant serves each day is considered a discrete variable. a Tru . e b Fals . e 7 points QUESTION 8 1. Asking 1000 people which brand of cigarettes they smoke is a Binomial Experiment. a Tru . e b Fals . e 7 points 1. QUESTION 9 Surveying 300 prisoners to see how many different crimes they were convicted of is an example of a binomial experiment. a Tru . e b Fals . e 7 points QUESTION 10 1. From past experience, a company has found that in cartons of transistors, 65% contain no defective transistors, 30% contain one defective transistor, 3% contain two defective transistors, and 2% contain three defective transistors. Find the standard deviation for the defective transistors. a 0.42 . 36 b 0.62 . 75 c 0.65 . 08 d 0.79 . 21 7 points 1. QUESTION 11 In a survey, 40% of Americans said they owned an answering machine. If 10 Americans are selected at random, find the probability that exactly 8 own an answering machine. a 0.01 . 1 b 0.10 . 9 0.00 8 d 0.02 . 1 c . 7 points QUESTION 12 1. A student takes an 8-question, true-false exam and guesses on each question. Find the probability of passing if the lowest passing grade is 6 correct out of 8. a 0.10 . 9 b 0.22 . 7 c 0.14 . 4 d 0.16 . 4 7 points 1. QUESTION 13 R.H. Bruskin Associates Market Research found that 30% of Americans do not think having a college education is important to succeed in the business world. If a random sample of 5 Americans is selected, find this probability: At most three people will agree with that statement. a 0.81 . 1 b 0.83 . 7 0.49 9 d 0.96 . 9 c . 7 points QUESTION 14 1. R.H. Bruskin Associates Market Research found that 30% of Americans do not think having a college education is important to succeed in the business world. If a random sample of 5 Americans is selected, find this probability: At least two people will agree with that statement. a 0.47 . 1 b 0.93 . 6 0.82 9 d 0.81 . 1 c . 7 points QUESTION 15 1. In a restaurant, a study found that 25% of all patrons smoked. If the seating capacity of the restaurant is 80 people, find the variance of the number of smokers. a 3.8 . 7 b 19. . 8 c 15 . d 4.4 . 5