Elective choices and non-participants
Elective choices and non-participants
Secondary 2
6 marks
TGM Original Questions
Each student chose at most one elective.
A class has 36 students: 20 boys and 16 girls. The table gives elective choices.
| Dance | Robotics | |
|---|---|---|
| Girls | \(8\) | \(3\) |
| Boys | \(6\) | \(9\) |
The remaining students chose neither elective.
- A student is selected at random from the class. Find the probability that the student
- is a girl,[1]
- is a boy choosing Dance,[1]
- chose Robotics,[1]
- is a girl who did not choose Dance.[1]
- One of the girls is selected at random. Find the probability that she chose neither elective.[2]
Solution:
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Answer:(a)(i) \(\frac{4}{9}\) (ii) \(\frac{1}{6}\) (iii) \(\frac{1}{3}\) (iv) \(\frac{2}{9}\) (b) \(\frac{5}{16}\).
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