As the new manager of a small convenience store, you want to understand the shopping patterns of your customers. You randomly 38.15 4.90 32.16 46.40 sample 20 purchases from yesterday's records. The amounts of those purchases (in dollars) are shown to the right. 37.10 34.56 64.65 50.93 Complete parts a) through c). 56.40 82.40 47 43 11.84 22.05 42.46 37.18 32.94 76.61 72.90 47.00 65.43 . . . a) Standardize the minimum and maximum purchase using a mean of 45.17 and a standard deviation of 20.5. The z-score for the minimum purchase is and the z-score for the maximum purchase is (Round to two decimal places as needed. )