[問題] 一題清大考題

看板Statistics作者a5170040 (小豬)時間16年前 (2008/01/12 21:30)推噓1(1推 0噓 0→)

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Toss a fair coin and take a step of size c to the right if head shows, to the left if tail shows. At the nth toss ,the poisition is a random variable Xn taking the values mc ,where m=n,n-2,...,-n a.Find P(Xn=mc) b.Show that for large n 2 1 -m / 2n P(Xn=mc)～ ----------- e √(n*pi/2) c.Find the probability that at the 50th step,X50 will exceed 6c. 麻煩各位了!實在不太清楚怎麼下手耶... 可以給個Hint也好! 謝謝!感激不盡! -- -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.127.51.80

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hi123

01/14 22:08, , 1^F

01/14 22:08, 1^F

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