Question: A random sample of 146 students in Math 1160 gave the following grade information ( A= 4.0, B= 3.0, C= 2.0, D= 1.0, and F=0). In the following table x = grade and f = number of students receiving this grade.

X 0 1 2 3 4

F 8 14 62 43 19

(a) Find the sample mean

(b) Find the sample variance

(c) Find the sample standard variation

(d) Compute the coefficient of variation for this data