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Percents

1.

Martha estimated there were 95 marbles in a jar for a contest. The actual number of marbles in the jar was 117. What was the percent error of Martha's estimation?

22%
81.20%
23.16%
18.80%

Sagot :

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It is 18.80%. You use the percent error formula: %error= (true value-estimated value)/true value. So (117-95)/117 = .188034188. You multiply by 100 since you are finding the percent not the decimal and you get about 18.80%
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