Final answer:
The Empirical Rule states that approximately 68 percent of the data falls within one standard deviation of the mean, about 95 percent falls within two standard deviations, and more than 99 percent falls within three standard deviations of a bell-shaped and symmetric distribution.
Step-by-step explanation:
The Empirical Rule is a statistical rule that applies to a bell-shaped and symmetric distribution, such as the normal distribution. It states that approximately 68 percent of the data falls within one standard deviation of the mean, about 95 percent falls within two standard deviations, and more than 99 percent falls within three standard deviations. For example, if the mean is 50 and the standard deviation is 10, approximately 68 percent of the data would fall between 40 and 60, 95 percent would fall between 30 and 70, and more than 99 percent would fall between 20 and 80.