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: 78 114 89 69 108 83 68 82 80 113 99 78 74 101 114 119 111 91 118 63 The data are to be organized into a frequency distribution using 5 classes. b. What class interval would you suggest? (Round the final answer to the nearest whole number.) 11.2 c. What lower limit would you recommend for the first class? 63 d. Organize the information into a frequency distribution and determine the relative frequency distribution. (Round the final answers to 2 decimal places.) Relative Units Frequency frequency to under to under to under to under to under Total e. Comment on the shape of the distribution. (Enter the intervals in ascending order.) The greatest concentration is in classes up to and up to