9. If I take a true-false test with 20 questions, what are the following probabilities, if I guess on each question. A true false test follows a binomial distribution, a. I get exactly 11 correct. b. I get at least 13 correct. c. I get at most 10 correct. d. I pass the test. I need to get 12 correct to pass the test. 10. If 30% of the students at a certain school are males. Consider a group of 10 males at that school. a. State the random variable b. Write the probability distribution c. Draw a histogram I d. Describe the shape of the histogram e. Find the mean f. Find the variance. g. Find the standard deviation