The pie chart above shows the statistical distribution of 80 students in five subjects in an examination. Calculate how many student offer Mathematics.
5x° + (16x - 24)° + 5x° + (4x + 12)° + (6x + 12)° = 360° 36x° - 24 + 12 + 12 = 360° 36x° = 360° x° = 360°36 = 10° Thus, the angle of sector representing Mathematics is 5 x 10° = 50°. Hence the number of students who offer mathematics is 50360×80≈11
