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Homework_4_Solutions

# Homework_4_Solutions - husband outlived the wife 7.12 An...

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Homework 4 Solutions 7.5 1000/125000 =1/125, or .008 7.9 a. The relative frequency interpretation of probability applies here. The probability was most likely determined by observing the number of Americans injured by lightning during a number of years and dividing this by the average population in those years. b. The personal interpretation of probability applies here. The probability was determined from the neighbor’s previous experience with tomato plants and her knowledge of the soil, sunlight and other conditions where her plants are grown. c. The relative frequency interpretation of probability applies here. The probability was determined by observing many, many properly cared for tomato plants, counting the number of plants that produced tomatoes, and dividing by the total number of plants observed. d. The relative frequency interpretation of probability applies here. The probability was determined by observing many U.S. couples and noting the proportion of couples in which the
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Unformatted text preview: husband outlived the wife. 7.12 An individual could determine his or her probability of winning this game by playing it a large number of times and recording how many games he or she won out of the total number of games played. 7.17 a. BY, BS, BA, YS, YA, SA. b. 1/6. 7.26 a. The approximate probability = 22/190 = .1158 that a randomly selected person will pick the number 3. b. The approximate probability = (2+6)/190 = 8/190 = .0421 that a randomly selected person will pick either 1 or 10. c. The approximate probability = (2+22+18+56+14)/190 = 112/190 = .5895 that a randomly selected person will pick an odd number. 7.35 a. No, they are not independent. P(A in both classes) ≠ P(A English) × P(A in history), as it would for independent events. b. P(A in either English or history) = P(A in English) + P(A in history) -P(A in both classes) = .70 + .60 -.50 = .80....
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