While writing an article on the high cost of college education, a reporter took a random sample of the cost of new textb

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While writing an article on the high cost of college education,a reporter took a random sample of the cost of new textbooks for asemester. The random variable x is the cost of one book. Her sampledata can be summarized by the following. (Give your answers correctto two decimal places.)
n = 22, Σx = 3518.6, and Σ(x - x)2 = 9852.4 (
a) Find the sample mean, x. $
(b) Find the sample standard deviation, s. $
(c) Find the 99% confidence interval to estimate the true meantextbook cost for the semester based on this sample.
Lower Limit $
Upper Limit $