SOLUTION: A sample of 144 firecrackers contained 9 "duds". How many duds would you expect in a sample of 320 firecrackers?

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Question 202773: A sample of 144 firecrackers contained 9 "duds". How many duds would you expect in a sample of 320 firecrackers?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
9/144:x/320
cross multiply
144x=2880
x=20