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: 94 102 89 107 83 73 118 108 66 79 61 118 112 115 112 84 76 85 82 102 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.) 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 final answers to 2 decimal places.) Units Frequency Relative 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