作者satanangel ( ^ ^)
看板Statistics
标题[问题] 急!!!请高手帮忙解答!
时间Sun Nov 5 20:51:35 2006
其实应该不难啦
但....
Keno is a favorite game in casinos, and similar games
are popular with the states that operate lotteries. Balls
numbered 1 to 80 are tumbled in a machine as the bets are
placed, then 20 of the balls are chosen at random, Players
select numbers by marking a card. The simplest of the many wagers
available is "Mark 1 number" . You payoff is $3 on a $1 bet if the
number you select is one of those chosen. Because 20 of 80 numbers
are chosen, your probability of winning is 20/80, or 0.25.
(a) What is the probability distribution ( the outcomes and their
probabilities) of the payoff X on a single play?
(b) What is the mean payoff?
(c) In the long run, how much does the casino keep from eavh dollar bet?
题目有点长
不知道有没有人可以帮忙解答呢?
谢谢!
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◆ From: 140.116.193.96
※ 编辑: satanangel 来自: 140.116.193.96 (11/05 20:52)
※ 编辑: satanangel 来自: 140.116.193.96 (11/05 20:52)