Concept explainers
Jockey International surveyed men to find out how old their oldest pair of underwear is. The results are summarized below:
Less than 1 year 17%
1–4 years 59%
5–9 years 15%
10–19 years 7%
20 or more years 2%
Based on these results:
(a) What is the probability that a randomly selected man has a pair of underwear that is older then 4 years? 9 years?
(b) What is the probability that a randomly selected man has no pair of underwear more than a year old?
(c) What is the probability that a randomly selected man has no underwear more than 9 years old?

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