Fireball actually has a 24 avg dmg, not 21, not 28. since 8d6 max = 48 /2 is 24. Or if you prefer avg of a 1d6 is 3 x8 roll is 24. Don't know where i got 21. Maybe miscalculated 6x8? Terrible really.
Dude, no. Just stop. You've messed the math up twice now which shows you really have no idea what you're talking about.
The average roll of a 6 sided die is 3.5, not 3. That's because you can't roll a 0. So the total options are 1+2+3+4+5+6 = 21. Divided by the 6 available options = 3.5
8 x 3.5 = 28.
