The data set below contains spending on products ($) during a three-month period by a sample of 15 customers receiving incentives through a mobile loyalty program. Complete parts (a) through (d) below. 55.85 22.82 67.69 46.17 57 37 108.09 50.76 35.17 8 78.61 50.26 63.73 59.94 41.09 56.09 53.24 a. Compute the mean and median. The mean is 56.46 (Round to two decimal places as needed. Do not include the $ symbol in your answer.) The median is 55.85 (Round to two decimal places as needed. Do not include the $ symbol in your answer.) b. Compute the variance, standard deviation, range, and coefficient of variation. The variance is (Round to two decimal places as needed. Do not include the $ symbol in your answer.)