1 1 / 1 pts The number x of bottles of garden plant fungicide sold by a garden center each day was recorded with the following results: x 0 1 2 3 4 5 6 P(x) .135 .141 .150 .143 .134 .122 .101 7 .074 The probability that at most two bottles will be sold on a randomly selected day is about: .724 .150 .574 .276 Correct! .426 Question 2 1 / 1 pts The number x of bottles of garden plant fungicide sold by a garden center each day was recorded with the following results: x 0 1 2 3 4 5 6 P(x) .135 .141 .150 .143 .134 .122 .101 The average number of bottles sold per day is about: 3.50 2.15 Correct! 3.14 1.72 2.86 7 .074 Question 3 1 / 1 pts Forty percent of passengers with a certain airline prefer a window seat. The probability that exactly two of the next ten person buying a ticket with this airline will prefer a window seat is about: Correct! .12 .80 .01 .36 .40 Question 4 1 / 1 pts The proportions of families with various numbers of children age 18 or under in a small town are given in the following table. One family is randomly selected from this town. x 0 1 2 3 4 P(x) .10 .40 .30 .10 .05 Find the probability that the selected family has at least 3 children age 18 or under. .10 Correct! .20 .30 .40 .50 Question 5 1 / 1 pts The proportions of families with various numbers of children age 18 or under in a small town are given in the following table. One family is randomly selected from this town. 5 .05 x P(x) 0 .10 1 .40 2 .30 3 .10 4 .05 Find the average number of children age 18 or under per family in this town. Correct! 1.75 1.0 1.5 2.0 2.5 Question 6 1 / 1 pts The probability that a person who has made a reservation for a trip on a twelve-vehicle ferry will actually arrive and make the trip is 0.85. If to account for "no-shows" the ferry company makes 13 reservations for a particular trip, the chance that all 13 vehicles will show is about 0.15 0.06 0.02 Correct! 0.12 0.08 Question 7 1 / 1 pts A trailer manufacturing company buys screw fasteners in boxes of 5,000. Two percent of all fasteners are unusable. The mean and standard deviation of the number x of unusable fasteners in a randomly selected box are about (2, 0.98) 5 .05 (10, 1) (200, 9.9) (100, 98) Correct! (100, 9.9) Question 8 1 / 1 pts There are two independent tests for a particular disease. The probability that Test I will fail to detect the disease in someone who has it is 0.30. The probability that Test II will fail to detect the disease that has it is 0.20. The probability that the disease will go undetected in someone who has it when both tests are applied is about 0.10 Correct! 0.06 0.50 0.32 0.60 Question 9 1 / 1 pts The following table denotes the probability distribution for a discrete random variable X. X -2 0 1 2 P(X) 0.1 0.3 0.2 0.3 Find P(X>0) 0.2 0.9 0.7 9 0.1 Correct! 0.6 0.3 Question 10 1 / 1 pts The following table denotes the probability distribution for a discrete random variable X. X P(X) -2 0.1 0 0.3 1 0.2 2 0.3 9 0.1 Find the expected value (mean) of X 2.0 2.4 -2.0 1.3 Correct! 1.5 Question 11 1 / 1 pts The following table denotes the probability distribution for a discrete random variable X. X P(X) -2 0.1 The standard deviation of X is closest to 7.65 Correct! 2.77 17.50 0 0.3 1 0.2 2 0.3 9 0.1 4.18 None of the above Question 12 1 / 1 pts The probability distribution of the number of pets x per household in a certain locality is given in the following table. x 0 1 2 3 P(x) ? .28 .40 .10 What is the probability that a randomly chosen household in this locality has no pets. .5 .25 Correct! .15 .95 .35 4 .07