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# 400Exam1A - STAT 400 Spring 2011 Version A Name AD1 Th 3 4...

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STAT 400 Spring 2011 Name _________________________ Version A AD1 AD2 AD3 AD4 Th 3 – 4 Th 3 – 4 We 4 – 5 We 4 – 5 135 MEB 137 Armory 329 Davenport 165 Noyes PeiBei Shi Jong Hyun Yun Jong Hyun Yun PeiBei Shi Exam 1 Please circle your discussion section. Be sure to show all your work; your partial credit might depend on it. No credit will be given without supporting work. The exam is closed book and closed notes. You are allowed to use a calculator and one 8½" x 11" sheet with notes on it. Page 1 2 3 4 5 Total Earned

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Page 1 of 5 1. Suppose P ( A ) = 0.45, P ( B ) = 0.40, P ( C ) = 0.50, P ( A B ) = 0.15, P ( A C ) = 0.20, P ( B C ) = 0.25, P ( A B C ) = 0.05. a) (2) Find P ( A C ) = _______________. b) (3) Find P ( A ( B C ) ) = _______________. c) (5) Find P ( B C | A ' ) = _______________.
Page 2 of 5 2. Alex sets two alarm clocks each night to ensure that he does not sleep through his 11:00 a.m. class. His primary clock properly sounds its alarm on 90% of the mornings, while his secondary clock rings its bell on only 60% of mornings. Assume the clocks operate independently.

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400Exam1A - STAT 400 Spring 2011 Version A Name AD1 Th 3 4...

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