Question: 57. Production Quality Control. A production process is checked periodically by a quality control inspector. The inspector selects simple random samples of 30 finished products

57. Production Quality Control. A production process is checked periodically by a quality control inspector. The inspector selects simple random samples of 30 finished products and computes the sample mean product weights x. If test results over a long period of time show that 5% of the x values are over 2.1 kilograms and 5% are under 1.9 kilograms, what are the mean and the standard deviation for the population of products produced with this process?

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