The table above gives the marks scored by a group of students in a test Use the table to answer the Question below

What 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 \(\frac{6}{11}\)
waec 2004mathematics

The correct answer is D. \(\frac{6}{11}\)

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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