What proportion of films will be too thin

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Problem: A film-coating process produces films whose thicknesses are normally distributed with a mean of 110 microns and a standard deviation of 10 microns. For a certain application, the minimum acceptable thickness is 90 microns.

Required:

Question 1: What proportion of films will be too thin?

Question 2: To what value should the mean be set so that only 1% of the films will be too thin?

Question 3: If the mean remains at 110, what must the standard deviation be so that only 1% of the films will be too thin?

Reference no: EM132464014

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