Suppоse we hаve cоllected sоme dаtа on time spending studying and exam performance. The data are shown below (27 pts, 3 pts each). Student Number of Hours Spent Studying (X) Exam Score (Y) A 28 95 B 25 95 C 3 58 D 10 75 E 0 44 F 15 83 G 20 91 H 24 87 I 7 65 J 8 70 a. Find the mean and (sample) standard deviation of X. b. Find the mean and (sample) standard deviation of Y. c. Calculate the correlation between time spending studying and exam performance. d. Find the regression line