作者nourri (nourri)
看板Statistics
标题[问题] 掷骰子的条件机率
时间Mon Oct 11 11:40:19 2010
不好意思
有一个很简单的问题一直搞不懂><
A pair of four sided dice is rolled and the sum is determined.
In a sequence of rolls the probability that a sum of 3 is rolled before a
sum of 5 is rolled can be thought of as the conditional probability of a sum
of 3 given that a sum of 3 or 5 has occurred.
虽然上面教了方法
但是我搞不懂为什麽可以这样解释
恳请高手赐教 谢谢
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1F：推 tyjgary:independent 10/13 14:05
2F：推 tyjgary:因为 sum=3 or sum=5 发生事件就决定了. 10/13 14:16
3F：→ tyjgary:而发生 sum=3 是题目定的事件. 所以可以这样来计算. 10/13 14:18
4F：→ nourri:谢谢 10/13 22:32
5F：→ happyntu:这个问题我觉得没想像的直觉跟简单，用乘法原理画图 11/11 16:34
6F：→ happyntu:再解无穷级数。参考下面文件43页下面开始 11/11 16:36
7F：→ happyntu:erdos.math.louisville.edu/~pksaho01/teaching/ 11/11 16:36
8F：→ happyntu:Math662TB-09S.pdf 11/11 16:37