RTP is a long-run average, not a promise for tonight: a game with 96% RTP has a...

https://www.quantifiedstrategies.com/rtp-variance-and-expected-value-applying-a-quantitative-framework-to-online-casino-gaming/

RTP is a long-run average, not a promise for tonight: a game with 96% RTP has a 4% house edge, meaning the casino keeps about 4p per £1 wagered over time. Volatility shapes how wins and losses are spaced; short sessions can swing sharply either way.