<PRE><B>Question 828287</B>
1. find the probability that the machine works?
2. Find the probability that the machine does not work? 
A machine part is made up of four independent part (A,B,C,D). To operate the machine, each part must work. The probabilities of the parts working are
P(A) = .9
P(B) = .7
P(C) = .8
P(D) = .9
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Answers:
1. P(it works) = 0.9*0.7*0.8*0.9 = 0.4536
2. P(does not work) = 1 - 0.4536 = 0.5464
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Cheers,
Stan H.
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