3-129. A trading company uses eight computers to trade on he New York Stock Exchange (NYSE). The probability of a computer failing in a day is 0.005, and the computers fail inde-

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3-129. A trading company uses eight computers to trade on
the New York Stock Exchange (NYSE). The probability of a
computer failing in a day is 0.005, and the computers fail inde-
pendently. Computers are repaired in the evening, and each day
is an independent trial.
(a) What is the probability that all eight computers fail in a day?
(b) What is the mean number of days until a specific computer fails?
(c) What is the mean number of days until alł eight computers
fail on the same day?
Let: X - number of computer failing in a day
Transcribed Image Text:3-129. A trading company uses eight computers to trade on the New York Stock Exchange (NYSE). The probability of a computer failing in a day is 0.005, and the computers fail inde- pendently. Computers are repaired in the evening, and each day is an independent trial. (a) What is the probability that all eight computers fail in a day? (b) What is the mean number of days until a specific computer fails? (c) What is the mean number of days until alł eight computers fail on the same day? Let: X - number of computer failing in a day
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