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Stat 21 Quiz _3 Key

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Unformatted text preview: y that Francie wins in the dice game. x P(x) Wins \$1 15/36 = .4167 Loses \$2 15/36 = .4167 No wins or losses (if two rolls are the same) 6/36 = .167 B) Draw a cumulative distribution function (cdf) for the amount of money that Francie wins in the dice game. C) How much money can Francie expect to win or lose if she plays the game five times? E(x) = (1*.4167) + (‐2 * .4167) + (0 * .167) = ‐0.4167 * 5 = -\$2.08 Stat 21 Quiz #3 October 12, 2011 3. True or False: the binomial formula can be used to compute the following probabilities. If so, calculate the probability. If not, explain why you cannot use the binomial formula. A) A highway patrol officer is looking for speeders on 880. So far, all 400 cars that have passed her patrol car have been under the speed limit. What are the chances that the next car will be speeding? False. This question is asking about geometric probability since it’s the probability that the first speeder will be the 401st car. Additionally, we don’t know probability and don’t know whether it’s the...
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