The yield of a chemical process is being studied. From previous experience, yield is known to be normally distributed and σ=3. The past five days of plant operation have resulted in the following yields 91.6, 88.75, 90.8, 89.67, and 91.7. Find a 95% two-sided confidence interval on the true mean yield. (a) Calculate the sample mean. Round your answer to 2 decimal places.
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