Question: A gambler will play roulette 50 times, betting a dollar on four joining numbers each time. If one of these four numbers comes up, she gets the dollar back, together with winnings of 8 dollars. If any other number comes up, she loses the dollar. So this bet pays 8 to 1, and there are 4 chances in 38 of winning.

Her net gain in 50 plays is like the sum of _____ __________ draws from the

box_____________________________.

Fill in the blanks; explain.