SOLUTION: A warning system installation consists of two independent alarms having probabilities of operating in an emergency of0.95 and 0.90 respectively. Find the probabilities that at leas
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Question 879927: A warning system installation consists of two independent alarms having probabilities of operating in an emergency of0.95 and 0.90 respectively. Find the probabilities that at least one alarm operates in an emergency
A. 0.995
B. 0.975
C. 0.95
D. 0.90
E. 0.855 Answer by ewatrrr(24785) (Show Source):
You can put this solution on YOUR website! 2 Alarms: p(working) .95 and .90
P(at least one working) = 1 - P(neither working) = 1 - (.05)(.10) = .995
