Question

# 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.

a) What proportion of films will be too thin?

b) To what value should the mean be set so that only 1% of the films

will be too thin?

c) If the mean remains at 110, what must the standard deviation be

so that only 1% of the films will be too thin?

#### Top Answer

a. 0.0228 b.mean =... View the full answer