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发帖数: 1378 | 1 A prisoner is trapped in a cell containing 3 doors. The
first door leads to a tunnel that returns him to his cell
after 2 days travel. The second to a tunnel that returns him
to his cell after 4 days travel. The third door leads to
freedom after 1 day of travel. Assume that the prisoner
selects doors 1,2, and 3 with probabilities 0.5, 0.3, and
0.2. (Perhaps they drug him so that he does not remember
which door he previoisly selected.) What is the expected
amount of time before the prisoner reach |
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