Gaps Crapot is always preaching about the gap at .27, so I googled it and he will be right 90% of the time
which is a pretty good chance it will be filled.
So what's that mean: when a stock price gap is observed, by a chance of 91.4% it will get filled in the future. In layman's word, 9 in 10 gaps get filled; not always, but pretty close.