2.) A stationery store wants to estimate the mean retail value of greeting cards that it has in its inventory. A random sample of 100 greeting cards indicates a mean value of $2.55 and a standard deviation of $0.44. a. ) Assuming a normal distribution, construct a 95% confidence interval for the mean value of all greeting cards in the store's inventory. b.) Suppose there are 2,500 greeting cards in the store's inventory. Use the results in (a) to assist the store owner in estimating the total value of the inventory