See Hint Assuming Ami has a typical reaction, do you think she is more likely to play BijongBall in the first case (when the pitch is "you can win 35% of the time") or the second case (when the game is advertised as "you have only a 65

Size of bet per grid number = Jackpot / Numbers in the grid
= $ 10,000 / (10 X 10) = $100 per option

Part 1

When 35 numbers selected

Bet expenses = 35 X size = $3500

Expected win = 35% X $10,000 = $3500

Expected payoff = Bet expenses - expected winn = $3500 - $3500 = 0

Part 2

65 numbers not selected = 35 numbers selected

Bet expenses = 35 X size = $3500

Expected win = 35% X $10,000 = $3500

Expected payoff = Bet expenses - expected winn = $3500 - $3500 = 0

Part 3

Ami is more likely to play in the first case as 35% winning chances seems to be very high in the first instance. On the other hand 65% losing chances as in the second game looks very high and therefore a show stopper for the casino guests.

Part 4

First alternative is the correct one as the framing effect is a phsycological bias where people decide on options based on whether the options are presented positively or negatively.