RTP is a long-run average; the house edge is the casino’s mathematical share:...
https://wiki-room.win/index.php/How_Do_I_Estimate_the_Cost_of_a_Casino_Session_Before_I_Play%3F
RTP is a long-run average; the house edge is the casino’s mathematical share: 96% RTP = 4% house edge. Volatility shapes how wins and losses cluster