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Window Frames and Defects

I need some help answering this question:
A manufacturer of window frames knows from long experience that 5% of the production will have some type of minor defect that will require an adjustment. What is the probability that in a sample of 20 window frames:
A. None will need adjustment?
B. At least one will need adjustment?
C. More than two will need adjustment?

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Solution Preview

This is a case of bionomial distribution with P(defect)=0.05 P(ND)=0.95
A. P(zero ...

Solution Summary

This solution calculates the amount of adjustment required if 5% of the production has a minor defect in a sample of 20 window frames.