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2.3.2 Diagrams to assist probability calculations

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Question 27

A batch of industrial components contains 5 'Grade-A' units, 1 'Grade-B' unit, and 1 'Grade-C' unit. A quality control officer selects two units at random, one after the other, without replacement.

a.

Construct a tree diagram to represent all possible outcomes of this selection process, including the probabilities for each branch.

[4]
b.

Determine the probability that the officer selects exactly one Grade-B unit and exactly one Grade-C unit.

[2]

2.3.2 Diagrams to assist probability calculations Questions

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