Cumulative Distribution Function
In probability theory and statistics, the cumulative distribution function (CDF) is the probability distribution function of a real-valued random variable X. It gives the probability that X will take a value less than or equal to x, for every value x. The CDF is a non-decreasing function and its value ranges from 0 to 1. The CDF is used to calculate the probability of a random variable falling within a certain range of values. It is also used to calculate the expected value and variance of a random variable.
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