During physical education class, students had to race the 100 m. The times recorded by the teacher are as follows. Temps 11 12 13 14 15 16 17 18 19 20 20 (s) Effectif 1 3 7 6 7 11 7 5 3 2 a) Plots the cast's headcount. I b) Determines the mean, mode, range, quartiles, variance, and standard deviation of the distribution