Elective choices and non-participants

Elective choices and non-participants

Secondary 2
TGM Original Questions

A class has 36 students: 20 boys and 16 girls. The table gives elective choices.

DanceRobotics
Girls\(8\)\(3\)
Boys\(6\)\(9\)

The remaining students chose neither elective.

  1. Find the probability that a selected student
    1. is a girl,
    2. is a boy choosing Dance,
    3. chose Robotics,
    4. is a girl who did not choose Dance.
  2. Given that a girl is selected, find the probability that she chose neither elective.

Solution:

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Answer:(a)(i) \(4/9\); (ii) \(1/6\); (iii) \(1/3\); (iv) \(2/9\); (b) \(5/16\).

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