Getting heads (or tails) when flipping a coin has a probability of:
[tex]P(H)=\frac{1}{2}[/tex]
When we flip the coin for the second time, the head is still there, so the probabilities are the same:
[tex]P(H)=\frac{1}{2}[/tex]
The probability of getting heads twice is the product of the individual (independent) events:
[tex]P(H,H)=\frac{1}{2}\cdot\frac{1}{2}[/tex]
Calculating:
[tex]P(H,H)=\frac{1}{4}[/tex]
