A reasonable estimate of the sum of 78 and 119 is 197.
8.0641
87+42+78 = 207
78 + 89 + 167 + 897 + 78 = 1309
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
How about: 11+67 = 78
Mean: 90.9 Median: 98.5 Mode: 30, 119
8.0641
87+42+78 = 207
78 + 89 + 167 + 897 + 78 = 1309
nothing
1, 3, 5, 9, 15, 45 (sum = 78).