The normal distribution is a probability distribution shaped like the classic bell curve. You will see a curve like this if you make a chart of, for example, the heights of a large number of adult women, you will see this curve take shape. There are many other instances where this distribution shows up, such as birth weights, the price of gas today at all the gas stations in the county, the amount of liquid in all the soda cans at the store, etc. This distribution is also linked to binomial probabilities.
Related links:
Wikipedia entry for Normal Distribution (gets fairly technical but you can read some of the basic details there)
simulation of a Galton Board (marbles bouncing down pegs on a board that we showed on the program)
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