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Poisson Process Probability Question Help

  1. Jun 10, 2005 #1
    I'm having a bit of trouble in coming up with the solution for this question

    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?
  2. jcsd
  3. Jun 10, 2005 #2
    If the process introduces 20 defects per 15000 cm^2, it introduces 1.0666... defects per 800 cm^2, and then you can use the Poisson directly.
  4. Jun 10, 2005 #3
    Thank you for the help. The answer I got using the Poisson Process eqn was .94470. Is this correct?
    Last edited: Jun 11, 2005
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