This list shows the age at which 38 U.S. Presidents died. 46 58 64 68 73 80 90 49 60 65 70 74 81 93 53 60 66 71 77 83 56 63 67 71 78 85 56 63 67 71 78 88 57 64 67 72 79 90 Before you can make a frequency table, you need to decide how to set up the age intervals. What is the BEST way to group these ages into six intervals? a. c. b. d. Please select the best answer from the choices provided