QUESTION 4 Which of the following are TRUE about a cumulative distribution function (c.d.f.), F(x)? [Note: five of the options are correct] A c.d.f. can be used to represent the probability distribution for a discrete random variable. A c.d.f. can be used to represent the probability distribution for a continuous random variable. 0 F(x) 1 for all x . OF(x) must montonically increase from 0 to 1 as x increases. OF(x) must be integrated over an interval of x-values to calculate a probability, e.g. P(a < X