In a class of 120 students, 18 of them scored an A grade in mathematics. If the section representing the A grade students on a pie chart has angle Z

^{o}at the centre of the circle, what is Z?-
**A.**

15 -
**B.**

27 -
**C.**

50 -
**D.**

52 -
**E.**

54

##### Correct Answer: Option E

##### Explanation

Total students = 120

grade = 18

Z^{o} = (frac{18}{120}) x (frac{360}{1})

= 54^{o}