SOLUTION: a sample of 136 firecrackers contained 5 duds. How many duds would you expect in a sample of 2720 firecrackers?

Question 536175: a sample of 136 firecrackers contained 5 duds. How many duds would you expect in a sample of 2720 firecrackers?
Answer by fcabanski(1391) (Show Source): You can put this solution on YOUR website!
Use ratio ---> duds/firecrackers.

The first ratio is 5 duds to 136 firecracks (5/136). It must equal the ratio of duds (we don't know, so call this x) to 2720 firecrackers (x/2720).
5/136=x/2720 (Cross multiply).

136x=5*2720--->136x=13600 (divide both sides by 136)

x=100

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