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a) It is known that 10% of a brand of television tubes will burn out before their guarantee has expired. If 1000 tubes are sold,
a) It is known that 10% of a brand of television tubes will burn out before their guarantee has expired. If 1000 tubes are sold, find the expected value and variance of Y, the number of original tubes that must be replaced.
b) Within what limits would Y be expected to fall with 75% probability (use Chebyshevs theorem)?
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