WAEC Mathematics 2014 Paper

Concept: A bar chart shows how many students obtained each score; the total number of test-takers is the sum of all the bar heights (frequencies).Explanation:Read the height of each bar as the number of students with that score. From the chart: Score $0$: $4$ students Score $1$: $2$ students Score $2$: $5$ students Score $3$: $6$ students Score $4$: $3$ students Therefore, total number of students is: $4 + 2 + 5 + 6 + 3 = 20$ Thus, $20$ students took the test.Answer: C. $20$