Probability

Probability

Secondary 4

The table shows the number of siblings of students in a class.

Number of siblings\(0\)\(1\)\(2\)\(3\)
Number of students\(4\)\(x\)\(7\)\(3\)

A student is selected at random. The probability that the student has at least two siblings is \(\frac12\).

  1. Find \(x\) and the class size.

  2. Find the probability that the student has exactly one sibling.

  3. Find the probability that the student has at most one sibling. Explain how this answer checks the information given.

Solution:

Solution locked

Sign in to view the step-by-step solution

Similar questions are unavailable for this question.
Answer:(a) \(x=6\), class size \(20\); (b) \(\frac3{10}\); (c) \(\frac12\)

Need help? Join our JC Math tuition classes.

Learn more