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TDAmeritrade is an online stock-trading service. To estimate the average number of trades made last month by TD's clients, you take a simple random of

TDAmeritrade is an online stock-trading service. To estimate the average number of trades made last month by TD's clients, you take a simple random of 250 clients and find the average number of trades in the sample is 45.8, with a sample standard deviation of 12.3. Show the appropriate 95% confidence interval for the population of TD's clients. Report the upper bound for your interval.

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