作者dinex (Dinex)
看板Statistics
标题[问题] 条件机率问题
时间Tue May 8 18:37:55 2012
各位大大们好，本人第一次在本版发言，若有冒犯之处请多包涵
最近选修机率和统计相关课程，练习题目做到此题，感到有点疑惑:
A father asks his son to cut their backyard lawn.Since he does not
specify which of three sons is to do the job, each boy tosses a coin to
determine the odd person, who must then cut the lawn. In the case that
all three gets heads or tails, they continue until reach a decision.
Let p be the probability of heads and q = 1-p, the probability of
tails.
(a) Find the probability that they reach a decison in less than n
tosses.
(b) If p = 1/2, what is the minimum number of tosses required to reach
a decision with probability 0.95.
这题也是一看知道要用P(E)=pP(E|H)+qP(E|T)这类等式，但P(E|H)和P(E|T)要怎麽表示
就不知道了...能否请大大们指点一下吗?谢谢大家>///<
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 125.232.24.98