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.

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.