Unformatted text preview: probability that (1) he guessed exactly two questions correctly? (2) he guessed at least one question correctly? Solution : Let X denote the number of questions he guessed correctly (1) P ( X = 2) = 5 2 ! ± 1 4 ² 2 ± 11 4 ² 3 = . 264 (2) P ( X ≥ 1) = 1P ( X = 0) = 1(11 / 4) 5 = . 763 1...
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 Spring '08
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 Probability, Quiz/Class Exercise

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