statistics
posted by steven on .
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1hour fight is .02. What is the probability that (a) both will fail? (b) Neither will fail? (c) One or the other will fail? Show all steps carefully

Pr(one)=.02
pr(both)=.02*.02
Pr(neither)=.98*.98
pr(one or other)=.02*.98+.98*.02