In the following probability distribution, the random variable x is the number of units a student is taking during the Spring 2020 semester. P(x) X 0.02 0.03 12 15 0.44 18 0.12 You should use Google Sheets or Excel for this problem. a. If a student is randomly selected, how many units would you expect the student to be taking? b. Would it be "unusual" if a randomly selected student is taking 18 units? Find the lower and upper bounds of what is considered "usual" and "unusual". Lower Upper Conclusion: Select an