Suppose I Tell You That I Flipped a Coin Multiple $75 \%$

Short Answer

Suppose I tell you that I flipped a coin multiple times and got $75 \%$ heads. Would you be reasonably convinced that this was not a fair coin (where "fair" means that the coin has a 50/50 chance of landing heads or tails)? If so, explain why. If not, describe what additional information you would ask for and explain why that information is necessary.