Chapter 12.3, Problem 26HP

To determine

To find: -the probability that it comes up heads on $21$ st flip.

Answer to Problem 26HP

  $\frac{\text{1}}{\text{2}}$

Explanation of Solution

Given information:

A fair coin is flipped $20$ times in a row and comes up heads every time.

Calculation:

Flipping a coin is independent event.

P (getting heads) = $\frac{1}{2}[\because n(s)=2]$

P (getting heads on ${21}^{st}$ flip) = $\frac{1}{2}$

Because it does not depends of previous $20$ flips.

Flip a coin is independent event.