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 9 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