[Statistics Quest] Fix Bayesian rain-bet payoff: $30 should be $33.33

Pippa! " P(rain tomorrow) = 0.3 means you would be roughly indifferent between (a) being given $30 if it rains, or (b) being given $10 unconditionally." 이 부분에서, $30를 $ $33.\dot{3}$으로 수정하는 것이 좋지 않을까?.