Ratios and rates help

A research study shows that three out of every twenty per owners got their pet from a breeder. Of the 122 animals cared for by a vet, how many would you expect to have been bought by a breeder?
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1 Answer

Expectation (mean) is 3/20 so we would expect 3/20*122=18.3, that is, about 18 pets to belong to people  who got their pets from a breeder.

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