A manufacturer of window frames knows from long experience that 20% of the production will have some type of minor defect that will require an adjustment. What is the probability that in a sample of 13 window frames:

A. None will need adjustment?(Round the final answer to 3 decimal places.)

Probability =

B. At least one will need adjustment?(Round the final answer to 3 decimal places.)

Probability =

C. More than two will need adjustment?(Round the final answer to 3 decimal places.)

Probability =