Experimental probability

Are these games fair? How can you tell?

Discs are flipped in the air. You win if all the faces show the same colour. What is the probability of winning?

Have a go at this game which involves throwing two dice and adding their totals. Where should you place your counters to be more likely to win?

Charlie thinks that a six comes up less often than the other numbers on the dice. Have a look at the results of the test his class did to see if he was right.

In this game you throw two dice and find their total, then move the appropriate counter to the right. Which counter reaches the purple box first?