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9. [-10.3 Points] DETAILS BBUNDERSTAT12 7.2.018.MI.S. MY NOTES ASK YOUR TEACH ER PRACTICE AN OTHER What percentage of hospitals provide at least some charity care? Based on a random sample of hospital reports from eastern states. the following information is obtained (units in percentage of hospitals providing at least some charity care): 56.5 56.3 52.9 65.5 59.0 64.7 70.1 64.7 53.5 78.2 m use SALT Assume that the population of): values has an approximately normal distribution. (a) Use a calculator with mean and sample standard deviation keys to nd the sample mean percentage E and the sample standard deviation 5. (Round your answers to four decimal places.) i % % S (b) Find a 90% confidence interval for the population average y. of the percentage of hospitals providing at least some charity care. {Round your answers to one decimal place.)