3. Consider a grocery store chain ( Chain C). Assume that the amount spent per month by the customers of Chain C is normally distributed. The mean "spending per month" = $ 300. The standard deviation of spending at Chain C is equal to $ 40. a.) Solve for a spending level that represents the 83d percentile of spending at Chain C. (3) b.) Solve for a spending level that represents the 17th percentile of spending at Chain C. (1)