The 68-95-99.7 Rule

The figure below will help you to visualize the 68-95-99.7 Rule (or the Empirical Rule) for a Normal Distribution.[br]The histogram displays 100 data values from a population N(0,1).[br]The histogram is centered on the mean of the data.[br]The width of each bin is the standard deviation of the data. Therefore, the bin boundaries are z-scores.[br]The numbers on each bin is the number of data values in the bin. Since there are 100 data values, these numbers[br]are percents.
The 68-95-99.7 Rule

Normal Distribution Practice Problems

There are 7 typically encountered Normal distribution problems. Drag the slider to try a different problem.[br]Check your answers as you go.
Normal Distribution Practice Problems

Normal Distribution puzzles

For each row in the table, find the values of a, b, c, and d.

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