Question

Four coins are tossed several times. Which of the following represents the outcome on a coin that may not be fair?

1st coin is tossed 50 times and gives 24 heads and 26 tails.

2nd coin is tossed 250 times so that P(heads) = 0.25.

3rd coin is tossed 16 times and gives P(tails) = 9/16

4th coin is tossed 25,000 times and gives 12,505 heads.

Answer 1

If a fair coin is tossed a great many times, you
expect the results to be 50-50 or close to it.

First coin: 24 and 26. 48% and 52%.

Second coin: 25% and 75% .

Third coin: 9/16 and 7/16. 56.25% and 43.75% .

Fourth coin: 12,505 and 12,495 . 50.02% and 49.98% .


If I'm betting my own jellybeans, then I would not go anywhere near
the second coin, and I'm not all that happy with the third coin either.