Jambmaths question:
The grades of 36 students in a class test are as shown in the pie chart above. How many students have excellent?
Option A:
12
Option B:
9
Option C:
8
Option D:
7
Jamb Maths Solution:
Total angle at a point in the pie chart
120o + 80 o + 90 o + xo = 360o
290o + xo = 360o
xo = 70o
In the pie chart, the students who have excellent grade took 70o in the pie chart.
The actually value of those whose grade are excellent is $\frac{{{70}^{\circ }}}{360}\times 36=7$
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