6. The probabilities thata player will get 4-9 questions righton a trivia quizare shown below. X 14 5 6 8 9 P(X 0.05 0.2 0.3 0.1 0.15 0.2 a. Find the mean. b. Find the variance. c. Find the standard deviation. 7. A pizza shop owner determines the number of pizzas that are delivered each day. X 33 34 35 36 37 P(X) 0.1 0.1 0.3 0.3 0.2 a. Find the mean. b. Find the variance. Thear's. c. Find the standard deviation. 8. A 33-year-old woman purchases a $300,000 term life insurance policy for an annual payment of $510. Based on a period life table for the U.S. government, the probability that she will survive the year is 0.999051. Find the expected value of the policy for the insurance company