A study of the consultants in a particular industry has determined that the standard deviation of the hourly fee of the consultants is $21. A random sample of 50 consultants in the industry has a mean hourly fee of $115. Find a 90% confidence interval for the true mean hourly fee of all consultants in the industry. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit: I Upper limit:

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