JAMB 2012 · UTME · Q41

Statistics: data & averages

The grades of 36 students in a class test are shown in the pie chart (Pass $120^\circ$ , Credit $80^\circ$ , Very good $90^\circ$ ). How many students have Excellent?

Worked solution (try it first)

The angles add up to $360^\circ$ , so Excellent is $360^\circ - (120^\circ + 80^\circ + 90^\circ) = 70^\circ$ .
Its share of the 36 students: $\frac{70}{360} \times 36 = 7$ , option D.

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