A distribution is usually described mathematically or graphically (or both). The distribution shows how probability is allocated over the range of possible values. If the variable is discrete, probability is assigned to isolated values. If the variable is continuous, probability is assigned to intervals, with the probability of a single variable being treated as zero. The best-known example of a distribution is the bell-shaped curve (the normal distribution) shown in the figure for the variable y, where ^ is the mean (and also the median). See Frequency Distribution, Mean, Median.

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