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Sample Problems for Exam 2

# Sample Problems for Exam 2 - STT 315 Spring 2008 Sample...

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STT 315 Sample Problems for Exam 2 Spring 2008 1. A fair die is given seven independent rolls. Determine the probability of getting two sixes (to 3 decimal points). a) .234 b) .416 c) .286 d) .184 e) none of these 2.3. In a set of six stocks, three pay dividends. Suppose that four stocks are selected at random from the six. 2. Determine the probability that the selected stocks include at least one that pays dividends. 3. Determine the probability that the selected stocks include the three that pay dividends 4-6. Consider the discrete probability distribution: x 1 3 4 8 P ( X = x ) 0.1 0.2 0.3 0.4 4. E ( X ) = 5. X P 1 ( < 4) = a) 0.1 b) 0.5 c) 0.6 d) 0.3 e) none of these 6. Var ( X ) = 7-10. Let X denote the number of successes in twenty independent Bernoulli trials, where each trial has probability of .80 of success. Answer (if given) is correct to 3 decimal places.

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Sample Problems for Exam 2 - STT 315 Spring 2008 Sample...

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