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On an average 1 in 8 0 0 computers crash during a thunderstorm. A company has 4 0 0 0 computers when it was hit

On an average 1 in 800 computers crash during a
thunderstorm. A company has 4000 computers when it was
hit by a storm.
(a) Compute the expected value and variance of number of
crashed computers
(b)Compute the probability that less than 10 computers
crashed
(c) Compute the probability that exactly 10 computers crashed

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