Final answer:
The cumulative distribution function (CDF) of a random variable X is defined as P(X ≤ x), which represents the probability that the random variable is less than or equal to x.
Step-by-step explanation:
The cumulative distribution function (CDF) of a random variable X is defined as P(X ≤ x), which represents the probability that the random variable is less than or equal to x. The CDF is a function of x and is used to describe the probability distribution of X.
The CDF can also be used to calculate the probability that X is greater than x, which is given by P(X > x) = 1 - P(X < x).