CitiBank recorded the number of customers to use a downtown ATM during the noon hour on 32 consecutive workdays. 25 37 23 26 30 40 25 26 39 32 21 26 19 27 32 25 18 26 34 18 31 35 21 33 33 9 16 32 35 42 15 24 Click here for the Excel Data File (a) Use Excel or MegaStat to sort and standardize the data. What is the z-score for the following x value? (Round your answer to 2 decimal places. A negative amount should be indicated by a minus sign.) x value z-score 21 -0.81 (b) Based on the Empirical Rule, are there outliers? No Yes (c) What percent of the data fall within 1 standard deviation of the mean? Within 2 standard deviations of the mean? (Round your answers to 2 decimal places. Omit the "%" sign in your response.) Empirical Rule Percent in interval (68.26%) 22 % Percent in interval (95.44%) 31 %