RTP describes the share of stakes a game is designed to return over a very...

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

RTP describes the share of stakes a game is designed to return over a very large number of plays; the house edge is the remainder. A 96% RTP means a 4% house edge on average—not a promise about one session