# quiz2sol - MA381 Fall 2007 Quiz 2 Due Quiz Policies This is...

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MA381 – Fall 2007 Quiz 2 Due 10/8/07 1 Quiz Policies : This is a take home quiz. You are allowed to use the textbook and your notes, but are not allowed to discuss this quiz with anyone or use any other means of assistance. You may ask me for clarification of any of the questions. Remember, cheating is bad – don’t do it. If you do cheat, you will get a zero on this quiz and, even worse, I will think ill of you. This is due at the beginning of class on the day indicated. 1. Suppose that a batch of 100 items contains 6 that are defective and 94 that are non-defective. If X is the number of defective items in a randomly drawn sample of 10 items from the batch, find: a. The probability that X = 0; b. The probability that X > 2. 94 10 : ( 0) 0.522 100 10 : ( 2) 1 ( 0) ( 1) ( 2) 94 6 94 6 9 1 8 2 1 0.533 100 100 10 10 0.01255 A P X B P X P X P X P X = = = = - = + = + =       = - - - = 2. Consider a roulette wheel consisting of 38 numbers – 1 through 36, 0 and 00.

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