Probabilities from a siblings table

Probabilities from a siblings table

Secondary 2
4 marks
TGM Original Questions

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

A survey of 72 students gives: 0 siblings: 18; 1: 27; 2: 12; 3: 7; 4: 5; at least 5: 3. Find the probability that a selected student

  1. has no siblings,[1]
  2. has at least 3 siblings,[2]
  3. does not have exactly 2 siblings.[1]

Solution:

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Answer:(i) \(\frac{1}{4}\) (ii) \(\frac{5}{24}\) (iii) \(\frac{5}{6}\).

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