The grades of 36 students in a class test are as shown in the pie chart. How many student has excellent?
A.
7
B.
8
C.
9
D.
12
Correct answer is A
degree of excellent in the pie-chart = 360o - (90o + 120o + 80o) = 360o - 290o = 70o
= 360o = 36 students
70 = \(\frac{70^o}{360^o}\) x 36 = 7