Thread: Coin Flip and calling randomly

1. Coin Flip and calling randomly

If there is a coin flip contest and there is a coin flipper continuously flipping the coin and there are three contestants
2. Always Calls Tails
3. Calls randomly

what is the percentage of right answers for each contestants and why. I think its 50% for always heads guy and always tails guy and zero for the random guy but my friend thinks its 50% for everyone but both of us are confused can someone
help us understand probabilities

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Thanks.

2. Re: Coin Flip and calling randomly

So you think that the person that just randomly chooses *can't* win ever?

3. Re: Coin Flip and calling randomly

Originally Posted by Dason
So you think that the person that just randomly chooses *can't* win ever?
Its not that i think he can't ever win but i think if this goes on for infinite times his percentage of winning will be really small

4. Re: Coin Flip and calling randomly

Let's do a thought experiment. Let's pretend that these three contestants actually exist. You're telling me that you think the guy that chooses randomly will have a "small" percentage of winning long term - let's just say that it is somewhere between 0 and 50%. That meant that if I became a contestant and *my* strategy was just "call the opposite of whatever the guy choosing randomly calls" that I would have a high percentage of winning - somewhere between 50% and 100% (because every time that guy lost I would win and every time he won I would lose).

Does that seem odd to you?

5. The Following User Says Thank You to Dason For This Useful Post:

codenamenikky (03-10-2014)

6. Re: Coin Flip and calling randomly

What's the probability that person 3 calls heads? Is the event that person 3 calls heads independent of the event that the coin lands on heads?

7. Re: Coin Flip and calling randomly

Thanks , that explains

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