A super shopper is defined as a shopper for whom at least 70% of the items purchased were on sale or purchased with a coupon. Recently collected data are given below. Age range, years 18-28 Midpoint x 23 29-39 34 40-50 45 51-61 62 and over 56 67 Percent of super shoppers 5% 36% 23% 16% 20% Using 46.1 Compute the standard deviation of a super shopper using the formula Round each step to 2 decimal places. 12.3 13.6 12.5 13.5 13.3 Next