Use a contingency table for marginal, conditional and union probabilities.

Use a contingency table for marginal, conditional and union probabilities.

6 marks

ProbabilityQuestionBank.pdf

The eye colour of 97 students is recorded in the table below. One student is selected at random.

	Brown	Blue	Green
Male	21	16	9
Female	19	19	13

Write down the probability that the student is a male.
Write down the probability that the student has green eyes, given that the student is a female.
Find the probability that the student has green eyes or is male.

[6]

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Answer:\(P(\text{green or male})=\frac{22+46-9}{97}=\frac{59}{97}\).

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