In this applet, we look at rolling dice again. Let X be the number of spots showing when one die is rolled. The mean value for rolling one die is 3.5, and the variance is . If Sn is the number of spots showing when n dice are rolled, then if n is ``large'' the random variable
should be approximately standard normal, so Sn itself should be approximately normal with mean 3.5*n and variance 35n/12. The red curve is the graph of the density function with these parameters.