The variance of 80 85 72 76 95 = 79.3
70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85 (including 70 and 85)
Equation: 90 + 85+ 80+76 = 331
62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88.60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90
83
The variance of 80 85 72 76 95 = 79.3
82.
70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85 (including 70 and 85)
Equation: 90 + 85+ 80+76 = 331
155
86 is the mean of 85, 91, 76, 85, and 93.
72 73 79 75 76 81 81 85 88
It is 86.
The composite numbers are: 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86 ,87, 88
62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88.60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90
Four: 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 100.Five: 60, 65, 70, 75, 80, 85, 90, 95, 100.Eight: 56, 64, 72, 80, 88, 96.Only 80 is on all three lists.
83