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8. What is the probability of obtaining two heads in three tosses of a coin? 9. The probability distribution shows the number of items a customer buys in a bookstore and their corresponding probabilities. Find the mean and variance of the distribution. X 2 3 4 5 P(X) 0.6 0.28 0.07 0.03 0.02 10. A. The table below shows the number of absences, X in Math12 course and the final exam grade Y, for students. Find the correlation coefficient and interpret the result. X 1 0 2 6 4 3 3 Y 95 90 90 55 70 80 56