John flipped a fair coin 120 times. It landed tails up sixty-five times

Question

What is the experimental probability that the coin will land tails yo the next time he flops the coin? Show your work. 

Answer 1

The experimental probability is just the proportion of the trials for which the event happens.

 

That is, if you do N trials and exactly K of them result in the event, then the probability of the event is estimated as p=K/N.

 

In your case the best estimate is

 

p = 65/120 = 13/24 = 0.541666...

 

for the probability of the coin coming up tails.