JAMB 2012 · UTME · Q42

The bar chart shows the distribution of marks in a class test. If the pass mark is 5, what percentage of students failed the test?

Worked solution (try it first)

Read the bars for marks 0 to 10 and add: $2 + 3 + 4 + 6 + 5 + 4 + 6 + 5 + 1 + 3 + 1 = 40$ students.
Failing means a mark below 5 (marks 0 to 4): $2 + 3 + 4 + 6 + 5 = 20$ students.
As a percentage: $\frac{20}{40} \times 100 = 50\%$ , option C.