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3. From data on a large sample of sales transactions, a small business owner reports that a 95% confidence interval for the mean profit per

3. From data on a large sample of sales transactions, a small business owner reports that a 95% confidence interval for the mean profit per transaction, , is (43.6, 105.9). Use these data to determine:

a. A point estimate (best guess) of the mean, .

b. A 90% confidence interval for the mean, .

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