The pie chart above shows the statistical distribution of 80 students in five subjects in an examination. Calculate how many student offer Mathematics.
-
A.
30 -
B.
11 -
C.
50 -
D.
20
Correct Answer: Option B
Explanation
5x° + (16x – 24)° + 5x° + (4x + 12)° + (6x + 12)° = 360°
36x° – 24 + 12 + 12 = 360°
36x° = 360°
x° = (frac{360°}{36})
= 10°
Thus, the angle of sector representing Mathematics is 5 x 10° = 50°. Hence the number of students who offer mathematics is
(frac{50}{360} times 80 approx 11)
There is an explanation video available below.