Outcome | Probability | Payoff

1 or 6 | 1/3 | 1

2-5 | 2/3 | -5

I apologize for the appearance of my table. The '|' lines are supposed to represent column separators Unfortunately, I cannot get the spacing correctly.

To find the expected return, multiply the probabilities with the payoffs and add.

(1/3)*1 + (2/3)*-5 = 1/3 -10/3 = -9/3 = -3

That would be for 1 game. For 9 games, multiply it by 9: -3*9 = -27

The changing the game question has many possible answers. Choose the expected return you want, then change the payoff from either or both of the outcomes to match that return.