Carmen Homework 7
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Is the following a legitimate discrete probability distribution? x 3 6 9 P(x) .45 .40 .15
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a. Yes, because P(x) is between 0 and 1 for all possible values of X. b. Yes, because P(x) is not the same for each value of X. c. Yes, because the total probability of X sums to 1. d. Yes, because both A and C are true.
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Use the following probability distribution to find the probability that X is exactly 6. X 3 6 9 P(x) .45 .40 .15
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a. 0.45 b. 0.40 c. 0.15 d. 0.55
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Use the probability distribution below to find the probability that X is 6 or greater. X 3 6 9 P(x) .45 .40 .15
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a. 0.45 b. 0.40 c. 0.15 d. 0.55
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For the discrete probability distribution below, the mean of X is 6 units. X 3 6 9 P(x) .45 .40 .15
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a. True b. False
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For the discrete probability distribution below, the variance of X is 5.4 units. X 3 6 9 P(x) .45 .40 .15
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a. True b. False
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If X and Y are random values, where MU of X = 4, SE of X = 8, MU of Y = 7, and SE of Y = 3 what is the mean of 3X - 2Y?
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a. 18 b. 1 c. -2 d. 5
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Suppose X is the number of cars that a family owns, and that X has the following probability distribution. X 0 1 2 P(x) .05 .39 .56 What is the chance that family owns more than one car?
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a. 0.95 b. 0.56 c. 0.39 d. 0.05
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Suppose X is the number of cars that a family owns, and that X has the following probability distribution. X 0 1 2 P(x) .05 .39 .56 Suppose you choose two families at random. What is the chance that family A owns exactly one car and family B owns exactly one car?
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a. 0.1521 b. 0.39 c. 0.78 d. 0.5623
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The number of injuries sustained by an entire football team during a typical college football game is a discrete random variable.
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a. True b. False
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If X is a random variable with standard deviation 15, then the standard deviation of 2X is 30.
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a. True b. False
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Answer Sheet
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1. d 2. b 3. d 4. b 5. b 6. c 7. b 8. a 9. a 10. a
