christopherj comments on Anthropic Atheism - Less Wrong
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Not so, if there is a crowd your being woken is stronger evidence of two people being woken than of one person being woken. In a crowd of 10, you have 1/10 chance of being woken if one random person is woken, and 19/100 chance of being woken at least once if two random people (with replacement) are woken. In a crowd of size 1, you have 100% chance to be woken at least once either way. Same odds == observation provides no evidence.
Don't compute the odds that two people have been woken, compute the odds that this is a two-wakings experiment. That's also higher than 50% and that (unlike "the odds that two people have been woken") stays higher when you shrink the crowd size.