Statistics

The life of a blood pressure monitor has a normal distribution with an average of 40 years and a standard deviation of one year. What should the warranty be to replace a malfunctioning monitor with - if the company does not want to replace more than 1% of all the monitor.

Thank you in Advance!

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asked by Ann
  1. Normal distribution table give μ+2.33σ as the 99% level.
    Calculate the warranty period accordingly.

    Tell me which brand it is that has 40 years mean life! :)

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    posted by MathMate
  2. Try z-scores:

    z = (x - mean)/sd

    Your data:

    2.33 = (x - 40)/1

    Solve for x.

    Note: 2.33 represents the z-score corresponding to the 1% in your problem.

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    posted by MathGuru

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