best ways tokeep eyes safe?
A 0.95 B 0.9 AB 0.88 a. The probability that the smoke will be detected by either device A or B or both devices P1 probability two devices work + A only work(B fail) + B only work (A fail) P1 AB + A(1-B) + B(1-A) P1 0.95*0.9 + 0.95(0.1) + 0.9(0.05) P1 0.995 b. The probability that the smoke will be undetected, A fail and B fail. P2 probability of A fail and probability of B fail P2 (1-A)*(1-B) P2 1 - P1 0.005 Note, the probability of both device can detected at the same time is not really needed, because we only need reliability of each component.
Fridges, Air conditioners, ovens and fryers. Enough? They are mainly appliances that are used to increase/ decrease the temperature of something/ somewhere. Hope it helps.
