Help Save & Exit The Quick Change Oil Company has a number of outlets. The numbers of oil changes at the Oak Street outlet in the past 20 days are as follows: 73 68 31 49 69 52 72 77 37 61 74 40 57 44 77 79 48 49 36 67 The data are to be organized into a frequency distribution. a. How many classes would you recommend? b. What class interval would you suggest? (Round up the final answer to the nearest whole number.) c. What lower limit would you recommend for the first class? d. Organize the information into a frequency distribution and determine the relative frequency distribution. (Round the "Relative frequency" answers to 2 decimal places.) Units Frequency Relative frequency to under to under to under