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Suppose scores on exams in Biology are normally distributed with an unknown population mean and a population standard deviation of 5.4 points. A random sample

Suppose scores on exams in Biology are normally distributed with an unknown population mean and a population standard deviation of 5.4 points. A random sample of 60 scores is taken and gives a sample mean of 81. Find a 90% confidence interval for the true mean of Biology exam scores. Show your work and write out what you enter into the calculator

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