A manufacturer of window frames knows from long experience that 10% 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?