2.10 Chemical analyses for manganese in 80 heats of 1045 steel. Data in 0.01% units. Suggest 66–68, 69–71, and so on for classes. Specifications: 70–90.

74 79 77 81 72 66 75 80 76 86 84 70 80 62 74 71 68 79 81 76 79 79 84 78 74 88 71 80 79 74 76 75 81 80 80 78 76 81 70 76 79 80 79 84 75 75 76 83 88 83 79 91 73 78 82 74 81 75 76 72 83 97 76 90 79 75 74 73 93 92 70 75 86 87 79 69 79 77 76 82 Find x-bar and s for the following:
Find x-bar and s for the following: