It dawned on me later that’s maybe what you meant.
Not sure, and I don’t even know where my old stats books ar to find the formula.
Would it be 1:5.5?
After waking up, this is a survivability problem.
Final survivablity is the product of the separate events.
First is 5/6ths. Second is 4/5ths.
Product is 20/30 or 2/3 survivability.
Fatality is 1-surviv, or 1/3.
Meanwhile, 2 tries of 6 is also 1/3.
Final answer.