Rejecting the Hypothesis of a Fair Coin: Confidence Level?

[Edward S]

Hi. At what level of confidence can I reject the hypothesis that a coin is "fair"? Meaning, the odds of a head is 50%. The coin is flipped 41 times and 31 are heads. Thank you!

 

[WMDhamnekar]

Hi. At what level of confidence can I reject the hypothesis that a coin is "fair"? Meaning, the odds of a head is 50%. The coin is flipped 41 times and 31 are heads. Thank you!

I shall reject the null hypothesis that " The coin is fair" at even 80% confidence level.