The thicknesses of glass sheets produced by a certain process are normally distributed with a mean of

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The thicknesses of glass sheets produced by a certain process are normally distributed with a mean of μ = 3.00 mm and a standard deviation of σ = 0.12 mm.
(a) What is the probability that a glass sheet is thicker than 3.2 mm?
(b) What is the probability that a glass sheet is thinner than 2.7 mm?
(c) What is the value of c for which there is a 99% probability that a glass sheet has a thickness within the interval [3.00 - c, 3.00 + c]?
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