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In a study by Cross et al., 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. The following table summarizes the frequency distribution for this random variable. Show your work. Number of Substance Used Q1. What is the probability that an individual selected at random used ve addictive substances? [2 points] Q2. What is the probability that an individual selected at random used fewer than three addictive substances? [2 points] Q3. What is the probability that an individual selected at random used between tow and ve addictive substances, exclusive? [2 points] Q4. What is the expected value of the addictive substances for an individual selected at random? [2 points] Q5. What is the standard deviation of the addictive substances for an individual selected at random? [2 points]