A two-way eyesight table

A two-way eyesight table

Secondary 2
3 marks
TGM Original Questions

Each object in the stated selection population is equally likely to be selected.

The table shows a class.

Short-sightedNot short-sighted
Boys\(8\)\(12\)
Girls\(6\)\(14\)

One student is selected. Find the probability that the student is

  1. a boy,[1]
  2. short-sighted,[1]
  3. a boy or not short-sighted.[1]

Solution:

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Answer:(i) \(\frac{1}{2}\) (ii) \(\frac{7}{20}\) (iii) \(\frac{17}{20}\).

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