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OpenStudy (anonymous):
The thicknesses of metal plates made by a particular machine are normally distributed with a mean of 4.3 mm and a standard deviation of 0.12 mm. (a) What are the upper and lower quartiles of the metal plate thicknesses? (b) What is the value of c for which there is 80% probability that a metal plate has a thickness within the interval [4.3 - c, 4.3 + c]?
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