RTP is a long-run average; the house edge is the casino’s share: 96% RTP = 4%...
https://www.quantifiedstrategies.com/rtp-variance-and-expected-value-applying-a-quantitative-framework-to-online-casino-gaming/
RTP is a long-run average; the house edge is the casino’s share: 96% RTP = 4% house edge. Volatility affects how wins and losses arrive. In a short session, results can swing widely—the average is no promise of what you’ll get.