A College Professor Noted That the Grades of His Students

Multiple Choice

A college professor noted that the grades of his students in an introductory statistics class were normally distributed with a mean of 76.5 and a standard deviation of 9. If 67.36% of his students received grades of C or above,what is the minimum score of those students receiving a grade of at least a C?

A) 67.36
B) 72.45
C) 66.56
D) 70.00