. What is the probability that in the time interval [0,200 hours] colour "red" is visible if it is known that a bulb servives this interval with probability 0.95?

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter12: Probability
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In a set of traffic lights, the colour "red"(as well as green and yellow) is indicated by two bulbs which operate independently of each other. Colour "red" is  clearly visible if at least  one bulb is operating. What is the probability that in the time interval [0,200 hours] colour "red" is visible if it is known that a bulb servives this interval with probability 0.95?

select one;

a. 0.0075

b. 0.9975

c. 0.05

d.0.0025

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