# Is a coin toss always 50 50?

### Is a coin toss always 50 50?

For example, even the 50/50 coin toss really isn't 50/50 — it's closer to 51/49, biased toward whatever side was up when the coin was thrown into the air. ... The reason: the side with Lincoln's head on it is a bit heavier than the flip side, causing the coin's center of mass to lie slightly toward heads.

### Is heads or tails really 50 50?

If a coin is flipped with its heads side facing up, it will land the same way 51 out of 100 times, a Stanford researcher has claimed. According to math professor Persi Diaconis, the probability of flipping a coin and guessing which side lands up correctly is not really 50-50.

### What are the odds of getting heads 11 times in a row?

Since each coin toss has a probability of heads equal to 1/2, I simply need to multiply together 1/2 eleven times. That's a 0.05% chance of flipping eleven heads in a row!

### What are the odds of flipping heads 100 times in a row?

The probability of flipping a fair coin and getting 100 Heads in a row is 1 in 2^100. That's 1 in 1,267,650,600,228,229,401,496,703,205,376.