If you want to check if you are within the statistic, do the following:
1) Ask Bitcasino for the house edge of the slots you played
2) Calculate the total amount of all your bets
Example: If your total bets are 20 million Euro and the house edge is 3,5%, then you statistically lost 700,000 Euro.
It doesn't work like that, I mean you can check it like that but it only works if you have placed a huge amount of bets.