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The daily sales of Burger Baby restaurants follow the normal distribution with a standard deviation of $4000. a. A sample is taken of 50 restaurants

The daily sales of Burger Baby restaurants follow the normal distribution with a standard deviation of $4000.

a. A sample is taken of 50 restaurants and the average sales were $40,000/day. What is the 99% confidence interval for the average restaurant sales?

b What is the probability that the average sales are really $36,000 or less per day? Assume the actual population average is $40,000 per day

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