Stat 21 Quiz _3 Key

Trueorfalsethebinomialformulacanbeusedtocomputethefoll

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Unformatted text preview: 0.97 0.03 1.03 (x ‐ u)^2 0.9409 0.0009 1.0609 (x ‐ u)^2 * P(X=x) 0.37636 0.000207 0.392533 Stat 21 Quiz #3 October 12, 2011 2. Francie is playing a dice game with another GSI. In the game, she rolls a dice two times. If the second roll is bigger than the first, she wins $3. If the second roll is less than first, she loses $2. If the second roll is equal to the first roll she wins no money, but does not lose money. A) Create a probability model for the amount of money that Francie wins in the dice game. x P(x) Wins $3 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 moneycan Francie expect to win or lose if she plays the game three times? E(x) = (3*.4167) + (-2 * .4167) + (0 * .167) = .4167 * 3 = $1.25 Stat 21 Quiz #3 October 12, 2011 3. True or False: the binomial formula can...
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