How do i compute this? Answer should be:

a.) 0.3025

b.) 0.5798

Your manufacturing plant produces air bags, and it is known that 30% of them are defective. Six air bags are tested.

(a) Find the probability that exactly one of them is defective. (Round your answer to four decimal places)

(b) Find the probability that at least two of them are defective. (Round your answer to four decimal places).