Google "Dice Roller" and Google will pop up a small dice-rolling applet. Roll the following collection of dice at the same time:

• Two six-sided dice.
• Two 8-sided dice.
• One 10-sided die.
• Five 12-sided dice.
• Three 20-sided dice.

Make a guess as to what you think the mean average sum will be. Then run an experiment to either reject your null hypothesis or not.