The document discusses continuous random variables. It defines a continuous random variable as having a range of real numbers. The probability density function f(x) is used to determine probabilities from areas. The properties of f(x) are described. The cumulative distribution function F(x) gives the probability that the random variable is less than or equal to x. The mean, variance, and standard deviation of a continuous random variable are defined in terms of integrals of the random variable and its probability density function.
