8.0641
78 + 89 + 167 + 897 + 78 = 1309
87+42+78 = 207
The sum is 1407.
26.
24 is a reasonable estimate. (78% of 31 is 24.18).
78 + 41 = 119
The sum of 67 and 78 is 145.
78 + 85 = 163
78 protons, 78 electrons and 119 neutrons
8.0641
Mean: 90.9 Median: 98.5 Mode: 30, 119
How about: 11+67 = 78
78 + 89 + 167 + 897 + 78 = 1309
87+42+78 = 207
1, 3, 5, 9, 15, 45 (sum = 78).
nothing