765
78 + 84 = 162
81 84 87
84 * 78 = 80*70 + 80*8 + 4*70 + 4*8 = 5600 + 640 + 280 + 32 = 6552
87
81 - 3 = 78 81 - -3 = 84
83
The variance of 73 72 67 74 78 84 79 71 76 76 79 81 75 80 78 76 78 = 16.8456
78 + 84 = 162
84+73+78 = 235.
4 plus 80 = 84
For 98 78 86 88 84 81 93 92 89 and 81: σ=6.2361
400 - 78 - 22 --84 - 16 - 81 - 19 - 27 = 400 - 78 - 22 + 84 - 16 - 81 - 19 - 27 = 241
Median: 80 Mode: 72, 80, 120, 98, 78, 84, 77
Numbers that round to 80 are those that fall between 75 and 84. When rounding to the nearest ten, any number 75 to 84 will round to 80. This is because the midpoint between 75 and 84 is 79.5, which rounds up to 80. Therefore, the numbers that round to 80 are 75, 76, 77, 78, 79, 80, 81, 82, 83, and 84.
84
81 84 87
78 appears more than any other number, so it is the mode.