The grades of 36 students in a test are shown i... - JAMB Mathematics 2005 Question

360^o - 36 students

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

N.B Excellent degree = 360^o - (120^o + 80^o + 90^o)

= 360^o - 290^o = 70^o