SOLUTION: A manufacturer of compact disk players subjects the equipment to a comprehensive testing process for all electrical and mechanical functions before it leaves the factory.Previously

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Question 856963: A manufacturer of compact disk players subjects the equipment to a comprehensive testing process for all electrical and mechanical functions before it leaves the factory.Previously data indicate that the probability of equipment passing the test 0.9.if four compact disk players are randomly selected,what is the probability
a.all four compact disk playes pass the test
b.no compact disk passes
c.at least three compact disks pass
d.less than two compact disks pass
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

p = .9,  n = 4

P(all four)= (.9)^4 = .6561

P(none) = (.1)^4 = .00009

Using TI

P(at least three) = binompdf(4, .9, 3) + binompdf(4, .9, 4)= .9477

P(x < 2) = (.1)^4 + binompdf(4, .9, 1) = .0037