JAMB Mathematics 2019 Paper

Concept:A pie chart represents each category as a fraction of the total data.The angle for a sector is found by multiplying that fraction by $360^\circ$.Explanation:First, find the total number of pupils in the class.Total number of pupils = $4 + 13 + 30 + 44 + 9 = 100$.The number of pupils who are 8 years old is $13$.So, the fraction of the class that is 8 years old is $\frac{13}{100}$.The angle corresponding to 8-year-olds is this fraction of the full circle.Angle = $\frac{13}{100} \times 360^\circ$.Angle = $\frac{13 \times 360}{100} = \frac{4680}{100} = 46.8^\circ$.Therefore, the angle for the 8-year-old group is $46.8^\circ$.Answer:$46.8^\circ$ (Option C).