While writing an article on the high cost of college education, a reporter took a random sample of the cost of new textbooks for a semester. The random variable x is the cost of one book. Her sample data can be summarized by the following. (Give your answers correct to two decimal places.) n = 29, Ex = 3574.6, and E(x - x)² = 9853.4 (a) Find the sample mean, x. 2$ (b) Find the sample standard deviation, s. 2$ (c) Find the 98% confidence interval to estimate the true mean textbook cost for the semester based on this sample. Lower Limit $ Upper Limit $

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