A teacher argues any relationship between student success and the level of class participation for his current class. To reach a reasonable conclusion, he randomly selected 6 students and prepared the following schedule that tabulates the overall success grades and participation ratios of these sample students. GRADE 1 60 70 2 75 80 STUDENT 3 35 50 4 50 65 5 90 95 PARTICIPATION RATE (%) a) Compute the standard deviation for each of the variables. (5 pts) b) Compute the covariance between success and participation. (5 pts) c) Estimate the Pearson correlation coefficient and interpret your finding. (5 pts) 6 83 90