GeoGebra

This applet allows the user to adjust the mean and standard deviation of a normal distribution. You may also calculate probabilities between two adjustable points.

This applet shows the proportion (relative frequency) of heads when flipping a fair coin. As the number of coins increases the long term relative frequency will approach 0.5 (the expected value).

This applet allows the user to specify the parameters of a binomial distribution, and calculate the probability of a specific outcome.

This is an applet that allows the user to adjust the bin width of a histogram.