5.107 Suppose that 10% of a brand of microcomputers will fail before their guarantee has expired. If

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5.107 Suppose that 10% of a brand of microcomputers will fail before their guarantee has expired. If 1,000 computers are sold this month, find the expected value and variance of Y, the number that have not failed during the guarantee period.

Within what limit would Y be expected to fall?

[Hint: Use Tchebysheff’s theorem.]

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Probability And Statistics For Engineers

ISBN: 9781133006909

5th Edition

Authors: Richard L Scheaffer, Madhuri Mulekar, James T McClave, Cecie Starr

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