Prof. Hardtack gave four Friday quizzes last semester in his 10-student senior tax account...

Prof. Hardtack gave four Friday quizzes last semester in his 10-student senior tax accounting class.(a) Find the sample mean, standard deviation, and coefficient of variation for each quiz. (b) How do these data sets differ in terms of center and variability? (c) Briefly describe and compare student performance on each quiz.