Podunk High School has a total enrollment of 36 students.The principal, interested in the variability of GPA's at PHS (using all 36 students), wanted to calculate the appropriate standard deviation.However, because the principlal doesn't know which standard deviation is appropriate, he asked you for your opinion.What would you tell him?

(A)s hat

(B)lower case sigma

(C)S

(D)Use any of the above, they are all appropriate.