A bulb of type A works with probability and a bulb of type B works with probability
MATHEMATICS · Single correct · A Level · Mathematics · Probability · Probability
Problem
A bulb of type A works with probability 0.9 and a bulb of type B works with probability 0.8. The performances of the two bulbs are independent. What is the probability that both bulbs fail?
(a) 0.72
(b) 0.28
(c) 0.02
(d) 0.18