exam2d-f97 - COURSE: MSCI 3700 EXAM 2 Name: S.S.#:...

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COURSE: MSCI 3700 Name: EXAM 2 S.S.#: INSTRUCTOR: Professor Malouf SEMESTER: FALL 97 1. What is the probability that a standard normal random variable is between -0.3 and -1.11? a) 0.7486 b) 0.4822 c) 0. .4222 d) 0.2514 e) 0.2486 2. What is the probability that a standard normal random variable is between -1.3 and 2.05? a) 0.8830 b) 0.4798 c) 0.9798 d) 0.4234 e) 1.0234
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3. What is the probability that a standard normal random variable is less than -2.1? a) 0.9821 b) 0.2088 c) 0.4821 d) 0.0179 e) 0.2907 4. The life of light bulbs is distributed normally. The average lifetime of a bulb is 800 hours and its standard deviation is 30 hours. What is the probability that a bulb will last at most 822.5 hours? a) 0.0062 b) 0.2774 c) 0.7734 d) 0.9938 e) 0.2266 5. The Eagle Electronic Company had an income of 56 million dollars last year. Suppose the mean income of firms in the industry for the year is 42 million dollars with a standard deviation of 6.6 million dollars. If incomes for the industry are distributed normally, what is the probability that a randomly selected firm will earn less than Eagle Electronic Company? a) 2.22 b) 0.9830
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c) 0.37935 d) 0.017 e) 0.483 6. The yearly income of a certain state university’s MBA class of ’97 is normally distributed with a mean of $45,700 and a standard deviation of $7,300. At least what yearly income would be expected for the
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This note was uploaded on 03/09/2011 for the course DSCI 2710 taught by Professor Hossain during the Spring '08 term at North Texas.

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exam2d-f97 - COURSE: MSCI 3700 EXAM 2 Name: S.S.#:...

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