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A hard disk manufacturing process desposites a thin coating of magnetic material on a plastic substrate. Empirical measurement has shown that the process introduces 20 defects per 15000cm squared. A disk pack contains 800cm squared of this material. A disk pack with one defect is marketable because the disk controller can compensate for one error by using a spare location. What is the percentage of marketable disk packs produced by this process?

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# Poisson Process Probability Question Help

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