An ethanol rairoad tari? a fee charged for shipments of ethanol on public railroads

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An ethanol rairoad tari? a fee charged for shipments of ethanol on public railroads. An agricultural association publishes tarilf rates for railroad—car shipments of ethanol. Assuming that the standard deviation of such tariff rates is $1300. determine the probability that the mean tariff rate of 350 randome selected railroad—car shipments of ethanol will be within $80 of the mean tari? rate of all railroad—car shipments of ethanol. Interpret your answer in terms of sampling error. The probability is D {Round to three decimal places as needed.)