Jule67. It hits exactly as expectation dictates , +/- 1 std on 85-90% of the time.

To know how many hits you can expect, on long run, devide 37 numbers by how many numbers you bet, multiply by amount of spins you will play/ observe. Consider to add/ minus at least 2 std ( sometime more) for possible variance.

I would strongly sudjest to Google "baesian probability". It will answer most of qwestions you may have and give you nice tool to operate probabilities calculations without rely on others.

Hope it help. Good luck , bro