Mathematics, 27.04.2021 14:50 briashia

The average lifetime of circulated $1 bills is 18 months. A researcher believes that the average lifetime is not 18 months. He researched the lifetime of 50 $1 bills and found the average lifetime was 18.8 months. The population standard deviation is 2.8 months. At a 2% significance level, can it be concluded that the average lifetime of a circulated $1 bill differs from 18 months

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