6.73 The lifetime distributions of high-speed recordable optical disks is assumed to follow lognormal distribution (Irine and

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6.73 The lifetime distributions of high-speed recordable optical disks is assumed to follow lognormal distribution

(Irine and Okino, IEEE Trans. on Magnetics, 2007).Suppose and weeks.

a Compute the mean and variance of this distribution.

b What percent of optical disks are expected to last over 20 weeks?

c If 98% of disks fail before a0 weeks, then determine the value of a0.

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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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