=+6. Construct two stem-and-leaf displays for the accompanying set of exam scores, one in which each stem value appears just once and the other in which stem values are repeated:

74 89 80 93 64 67 72 70 66 85 89 81 81 71 74 82 85 63 72 81 81 95 84 81 80 70 69 66 60 83 85 98 84 68 90 82 69 72 87 88