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"Odds" is an equivalent way of thinking about this probability: how much would you bet against my bet of $1 that there will be two people in this room with the same birthday?
Even money (odds)? If so, then you would be saying that the probability of there being two people with the same birthday is 1/2.
What's the probability that an 80-year-old white female in Wood County, Ohio will survive another year?
That's the kind of question an insurance adjuster is concerned about, as am I: that's my mom!
An approximation can be obtained by looking at records for Wood County for the last year:
No probability can tell what will happen to a specific person, however (unless an event is certain or impossible).
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The sample space (or "universe") for a roll of two dice. |
Let's do a few more calculations: