waecmaths question:
The bar chart shows the score of some students in a test.If one student is selected at random, find the probability that he/she scored at most 2 marks
Option A:
$\tfrac{11}{18}$
Option B:
$\tfrac{11}{20}$
Option C:
$\tfrac{7}{22}$
Option D:
$\tfrac{5}{19}$
waecmaths solution:
$\begin{align} & \text{At most 2marks}=\text{Students who got 0 + Students who got 1 + students who got 2} \\ & \text{At most 2marks}=4+2+5=11 \\ & \text{Probability of (At most 2marks})=\frac{11}{20} \\\end{align}$
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