Question: 9. If the probability is 0.001 that a type-X 20-W bulb will fail in a 10-hour test, what is the probability that a sign constructed

9. If the probability is 0.001 that a type-X 20-W bulb will fail in a 10-hour test, what is the probability that a sign constructed from 1000 such bulbs will burn 10 hours:

124 3 Elements of Probability

(a) With no bulb failures?

(b) With one bulb failure?

(c) With k bulb failures?

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