The grades of 36 students in a class test are a... - JAMB Mathematics 1999 Question

The grades of 36 students in a class test are as shown in the pie chart. How many student has excellent?

degree of excellent in the pie-chart = 360^o - (90^o + 120^o + 80^o) = 360^o - 290^o = 70^o

= 360^o = 36 students

70 = (\frac{70^o}{360^o}) x 36 = 7