Mathematics
Mathematics, 15.07.2019 06:00, DojaCat

Traffic engineers install 12 street lights with new bulbs. the probability that a bulb will fail within 50000 hours of operation is 0.26. assume that each of the bulbs fails independently. (a) what is the probability that fewer than two of the original bulbs will fail within 50000 hours of operation? (b) what is the probability that no bulbs will have to be replaced within 50000 hours of operation? (c) what is the probability that more than four of the original bulbs will need replacing within 50000 hours?

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Traffic engineers install 12 street lights with new bulbs. the probability that a bulb will fail wit...

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