Class groups and gender

Class groups and gender

Secondary 2
3 marks
TGM Original Questions

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

A class has 24 Group-A, 15 Group-B and 9 Group-C students. The numbers of girls are 14, 6 and 5, respectively. One student is selected. Find the probability of selecting

  1. a non-A student,[1]
  2. a Group-B boy,[1]
  3. a Group-C girl or Group-A boy.[1]

Solution:

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Answer:(i) \(\frac{1}{2}\) (ii) \(\frac{3}{16}\) (iii) \(\frac{5}{16}\).

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