Please help me these questions. If it is feasible, please give me your calculations (formula...)Thanks so much

Use the following information to solve problems 17-20 For a sample of students, the exam score frequency distribution is shown below. Class Frequency 90-98 6 99-107 22 108-116 43 117-125 28 126-134 9 16. The median score is: a. 108 b. 112 c. 113 17. The standard deviation of the scores is; a. 9.03 b. 9.07 c. 10.3 18. The variance of the scores is: a. 81.5 b. 82.3 c. 106.1 19. The coefficient of variation in this sample data set is: a. 0.07 b. 0.08 c. 0.09