States that in a normal distribution about 68%, 95% and 99.7% of outcomes are respectively within 1, 2, and 3 standard deviations of the mean. Average value of the distribution. Most likely value of the distribution. Center value of the distribution. A mathematical function that describes the probability that the random variable takes on a value within a specific range of values. A value of the random variable that leaves a certain percent of the distribution to its left. 1. Median 2. Mode 3. Mean 4. Probability density function 5. Percentile 6. Empirical Rule