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Old 08-02-2007   #1
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Default Statistics & Probability Help !?

Hi everyone, I have a test coming up next week and I need a little help, thanks in advance !The quality goal for a wafer fabrication plant states that no more than 10% of its wafers should fail to attain quality standards. Suppose that a random sample of 120 wafers will be tested, and the fabrication process will be declared to be outside standards if at least 18 wafers do not attain quality standards. Let denote the probability that a randomly selected wafer does not attain standards and determine the probability that the random sample of 120 wafers causes the process to be declared outside standards when p=.08, p=.10, and when p=.20.
Old 08-02-2007   #2
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This is a binomial distribution problem...For p=0.10Pr(18 or more wafers fail the test)=1-Pr(17 or less wafers fail the test)=1-sum (for i=0 to 17) 120Ci * (0.1)^i * (0.9)^(120-i)

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