Exam-Style Problem

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June 2012 p63 q5
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Suzanne has 20 pairs of shoes, some of which have designer labels. She has 6 pairs of high-heeled shoes, of which 2 pairs have designer labels. She has 4 pairs of low-heeled shoes, of which 1 pair has designer labels. The rest of her shoes are pairs of sports shoes. Suzanne has 8 pairs of shoes with designer labels in total.

(i) Copy and complete the table below to show the number of pairs in each category.

Designer labelsNo designer labelsTotal
High-heeled shoes6
Low-heeled shoes4
Sports shoes
Total20

Suzanne chooses 1 pair of shoes at random to wear.

(ii) Find the probability that she wears the pair of low-heeled shoes with designer labels.

(iii) Find the probability that she wears a pair of sports shoes.

(iv) Find the probability that she wears a pair of high-heeled shoes, given that she wears a pair of shoes with designer labels.

(v) State with a reason whether the events ‘Suzanne wears a pair of shoes with designer labels’ and ‘Suzanne wears a pair of sports shoes’ are independent.

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