作者Pitter ()
看板Statistics
标题[问题]几何分配的期望..
时间Sat Jan 17 20:11:12 2009
A miners is trapped in a mine containing three doors. The first door leads to
a tunnel which takes him to safety after two-hour’s travel. The second door
leads to a tunnel which returns him to the mine after three-hours travel. The
third door leads to a tunnel which returns his mine after 5 hours. Assuming
that the miner is at all times equally likely to choose any one of the doors,
what is the expected length of time until the miner reaches safety?
答案是10(hours)，但小弟不太懂解答的计算，希望高手能帮麻指点，谢谢
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