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people over 30?

* a) 2.5
* b) 0.4
* c) 0.5
* d) 30%

Answer - a

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Among people with age under 30 what are the odds that they always exceed the speed limit?	Scenario: A newspaper article reported, Children who routinely compete in vigorous after-school sports on smoggy days are three times more likely to get asthma than their non-athletic peers. (Sacramento Bee, Feb 1, 2002, p. A1) Of the following, which is the most important additional information that would be useful before making a decision about participation in school sports?