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): 56.9 55.9 52.6 66.2 59.0 64.7 70.1 64.7 53.5 78.2 assume that the population of x values has an approximately normal distribution. (a) use a calculator with mean and sample standard deviation keys to find the sample mean percentage x and the sample standard deviation s. (round your answers to one decimal place.) x = 6212 % s = 8.1 % (b) find a 90% confidence interval for the population average μ of the percentage of hospitals providing at least some charity care. (round your answers to one decimal place.) lower limit % upper limit %