test2_f02

test2_f02 - Second Exam - Fall 2002 - ST 370 Online - A...

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Second Exam - Fall 2002 - ST 370 Online - 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. Let X be a random variable. Suppose that Pr ( X a )= ( X<a ) for any real number a . Then X is a A. continuous random variable. B. Bernoulli random variable. C. discrete random variable. D. all of the above. E. none of the above. 2. A system has the following five independent components with reliabilities written within the component boxes. Find the reliability of the system (to three significant digits). |------| |--|R1=.8 |--| | |------| | |------| | | |--|R4=.9 |--| | |------| | | |------| | ----|--|R2=.8 |--|----| |---- | |------| | | |------| | | | |--|R5=.9 |--| | |------| | |------| | |--|R4=.8 |--| | |------| | A. .720 B. .821 C. .991 D. .982 E. none of the above. 3. Suppose that ( A | B ( A ). What can we say about the events A and B ? A. A and B are complementary events. B. A and B are independent events. C. A and B are mutually exclusive events. D. A and B are dependent events. E. none of the above. 1
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4. The probability that a standard normal Z lies between -1.33 and 2.66 is A. .9043 B. .8985 C. .0287 D. .5395 E. none of the above. 5. A certain standardized test has approximately a normal distribution with a mean of 600 and a standard deviation of 40. What is the 75th percentile (rounded to 3 decimals)?
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This note was uploaded on 01/16/2012 for the course ST 370 taught by Professor Nail during the Spring '08 term at N.C. State.

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test2_f02 - Second Exam - Fall 2002 - ST 370 Online - A...

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