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A manufacturer of metal pistons finds that on the average, 12% of his pistons are rejected because they are either oversize or undersize. What is the probability that a batch of 10 pistons will contain (a) no more than 2 rejects? (b) at least 2 rejects?
A question in probability unit


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P Rejected: 0.12  
n: 10  
a)  no more than 2 rejects ( P ( x<=2))
p(x<=2)  = 0.8913
b) At leat]st 2 rejects ( 1-P(x<=1)
p(x>=2)   0.3417
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