In a study by Cross et al. (A-2), patients who were involved in problem gambling treatment were asked about co-occurring drug and alcohol addictions. Let the discrete random variable X represent the number of co-occurring addictive substances used by the subjects. Table 4.2.4 summarizes the frequency distribution for this random variable.

(a) Construct a table of the relative frequency and the cumulative frequency for this discrete distribution.

(b) Construct a graph of the probability distribution and a graph representing the cumulative probability distribution for these data.