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probability density function
probability density function A probability density function is a mathematical rule for a continuous random variable that lets you find the probability of getting values within an interval, since a single exact value has zero probability.
A probability density function is a mathematical rule for a continuous random variable that lets you find the probability of getting values within an interval, since a single exact value has zero probability. Its values are never negative, and over the full distribution the total probability adds up to 1.