The table below gives the marks scored by a group of students in a test...
MATHEMATICS
WAEC 2004
The table below gives the marks scored by a group of students in a test Use the table to answer the Question belowWhat is the probability of selecting a student from the group that scored 2 or 3?
- A. \(\frac{1}{11}\)
- B. \(\frac{5}{22}\)
- C. \(\frac{7}{22}\)
- D. \(\frac{6}{11}\)
Correct Answer: D. \(\frac{6}{11}\)
Explanation
Prob (2 or 3) = prob(2) + prob(3)
Prob (mark 2) \(=\frac{7}{22}\) + Prob(mark 3) = \(\frac{5}{22}\)
Prob(2 or 3) \(=\frac{7}{22}+\frac{5}{22}=\frac{12}{22}=\frac{6}{11}\)
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