Date: March 11th, 2026 12:29 PM
Author: Emilio Plan Truster
Sleeping Beauty volunteers to undergo the following experiment and is told all of the following details:
On Sunday she will be put to sleep. Once or twice, during the experiment, Sleeping Beauty will be awakened, interviewed, and put back to sleep with an amnesia-inducing drug that makes her forget that awakening. A fair coin will be tossed to determine which experimental procedure to undertake:
If the coin comes up heads, Sleeping Beauty will be awakened and interviewed on Monday only.
If the coin comes up tails, she will be awakened and interviewed on Monday and Tuesday.
In either case, she will be awakened on Wednesday without interview and the experiment ends.
Any time Sleeping Beauty is awakened and interviewed she will not be able to tell which day it is or whether she has been awakened before.
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Sleeping Beauty is now awakened and being interviewed. What is her belief now for the probability that the coin landed heads?
(http://www.autoadmit.com/thread.php?thread_id=5844369&forum_id=2Firm#49734602)