Quiz 2 Review 2009 09 20

Quiz 2 Review 2009 09 20 - vehicles using the acceleration...

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Click to edit Master subtitle style 10/17/09 ENMA 420/520 Quiz 2 Review
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10/17/09 Comments Rationale Forms the basis for partial credit; Goal is that you absorb essential concepts Strong partial credit given for rational alternative approaches, even if not exactly correct Cross-Checks
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10/17/09 Problem 1 For early radar sets, approximately 60% of returns (“blips”) represented aircraft. During a particular engagement, an operator had 5 returns displayed at various locations and times and reported each to sector air defenses. Assuming that the events are independent computer the probability of each of the following
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10/17/09 Problem 1 (Cont’d) . 0 07 8
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10/17/09 Problem 2 A study of vehicle flow characteristics on acceleration lanes at a major freeway found that one out of every six vehicles uses less than one-third of the acceleration lane before merging into traffic. Suppose the number of
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Unformatted text preview: vehicles using the acceleration lane per minute has a mean equal to 1.1. a. What is the probability that more 10/17/09 Problem 2 (Contd) 10/17/09 Problem 3 A neighborhood bordering an airfield has noise level per jet takeoff that is normally distributed with a mean of 100 decibels and a standard deviation of 6 decibels. a. What is the probability that a randomly selected jet will generate a noise level greater than 108 decibels in this neighborhood? 10/17/09 Problem 3 (Contd) 10/17/09 Problem 3 (Contd) 10/17/09 Problem 4 Suppose that the fraction of defective modems shipped by a data-communications vendor has an approximate beta distribution with D = 5 and & = 21. a. Find the mean and variance of the fraction of defective modems per shipment. What is the probability that a 10/17/09 Problem 4 (Contd) 10/17/09 Problem 4 (Contd)...
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Quiz 2 Review 2009 09 20 - vehicles using the acceleration...

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