WAEC Mathematics 2014 Paper

Concept:Probability of an event = $\frac{\text{favourable outcomes}}{\text{total outcomes}}$.Explanation:From the bar chart, the scores and their frequencies are shown. "At most 2 marks" means scores $0$, $1$, or $2$. The number of students who scored $0$ marks is $5$. The number who scored $1$ mark is $2$. The number who scored $2$ marks is $4$. So, favourable students $= 5 + 2 + 4 = 11$. Total number of students from the chart $= 20$. Required probability $= \frac{11}{20}$.Answer:$\frac{11}{20}$ This corresponds to Option B.