RTP is a long-run average; the house edge is the casino’s mathematical share:...
https://www.hometalk.com/member/262788598/nina1700417
RTP is a long-run average; the house edge is the casino’s mathematical share: 96% RTP = 4% house edge. Volatility affects how wins and losses are spaced out. In a short session, results can swing sharply, so outcomes may differ widely from the average.