A researcher records the repair cost for 2020 randomly selected stereos. A sample mean of $57.17$ 57.17 and standard deviation of $19.26$ 19.26 are subsequently computed. Determine the 90%90% confidence interval for the mean repair cost for the stereos. Assume the population is approximately normal. Step 1 of 2: Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.