The Cumulative Distribution Function F(x) of a Continuous Random Variable

Multiple Choice

The cumulative distribution function F(x) of a continuous random variable X with the probability density function f(x) is which of the following?

A) The area under f over all values x.
B) The area under f over all values that are x or less.
C) The area under f over all values that are x or more.
D) The area under f over all non-negative values that are x or less.