test2_f04

test2_f04 - Exam 2 - Fall 2004 - ST 370 Online/Distance - A...

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Exam 2 - Fall 2004 - ST 370 Online/Distance - A Darken the circle on the answer sheet corresponding to your answer. Use a number 2 pencil. Stray marks on the form may cause errors. All questions are worth 5 points. 1. What is the probability that a standard normal random variable Z lies between - 2 . 42 and 1.76? (to 3 decimal places) A. .953 B. .031 C. .005 D. .008 E. None of the above. 2. Consider a system having four independent components with reliabilities 0.90, 0.80, 0.95, and .98. If the first two components operate in parallel in a mini-system, the second two also operate in parallel in a second mini-system, and the two mini-systems are in series, then the system reliability is (to 3 decimal places) A. 0.556 B. 0.931 C. 0.709 D. 0.979 E. none of the above 3. Suppose that construction site fatalities occur at the rate of 2 per month in North Carolina. What is the probability of two or more fatalities in June of the current year? (to 3 decimal places) A. 0.735 B. 0.342 C. 0.406 D. 0.234 E. none of the above 4. Independence of two events A and B does not imply that A. Pr ( A and B )= ( A )+ ( B ) B. ( B | A ( B ) C. ( A and B ( A ) ( B ) D. ( A | B ( A ). E. None of the above 1
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Use the following information to answer the next 3 questions. Knee flexion, a measure in degrees of the knee range of motion, is normally distributed when measured on a large group of adult males.
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test2_f04 - Exam 2 - Fall 2004 - ST 370 Online/Distance - A...

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