The probability that a single radar station will detect a low-flying aircraft is 0.35.

(Enter probabilities with a leading zero and rounded to 4 decimal places.)

(a) If there are 5 radar stations operating, what is the probability that none of them detects the aircraft?

(b) If there are 5 radar stations operating, what is the probability that at least 2 of them detect the aircraft?

(c) If there are 6 radar stations operating, what is the expected number of stations that will detect the aircraft? (Do not round your answer.)

(d) How many radar stations would be needed to be at least 98% certain that one or more stations will detect the aircraft?