Question: We know that certain chemical process has a population standard deviation of 5 and the overall yields are normally distributed.We attempt to improve the process

We know that certain chemical process has a population standard deviation of 5 and the overall yields are normally distributed.We attempt to improve the process and take samples over the first 5 days.The mean of these 5 samples is 84.What is the 99% confidence interval for the true process yield?

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