Re: HeroScape Math for a custom power
Math teacher is correct.
Think of attack rolls like coin flips: 50% chance each of heads(skulls) or tails(non-skulls).
So with one coin, you have two equally likely options: H or T. Half of those have exactly one head.
With two coins, you have four equally likely options: TT, TH, HT, or HH. Half of those have exactly one head.
Your playtesting experience of 1 skull being "most likely" is correct, but there's three options: 0, 1, or 2 skulls. Referring back to the earlier list of four options, 0 skulls happens 1/4 of the time, as does 2 skulls. 1 skull happens 2/4 (or 1/2) of the time making it the most likely option. But that doesn't mean it happens most of the time, it just happens more than any other single option.
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