A survey asks a random sample of 2500 adults in Ohio if they support an increase in the state sales tax from 5.25% to 5.50%, with the additional revenue going to education. Let X denote the number in the sample that say they support the increase. Suppose that 30% of all adults in Ohio support the increase. 8. The mean of X is a. 30. b. 525. c. 750. d. 1750. 9. The standard deviation of X is a. 22.91. b. 27.39. c. 5255. d. 750.