作业帮一道GMAT题目During an experiment,some water was removed from eac
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一道GMAT题目
During an experiment,some water was removed from each of 6 tanks.If the standard deviation of volumes of water in the tanks at the beginning of the experiment was 10 gallons,waht is the standard deviation of the volumes of water at the end of experiment?
(1)for each tank,30% volume of water that is in the tank at the beginning of the experiment was removed during the experiment
(2)the average volume of water in the tanks at the end of the experiment was 63 gallons.
During an experiment,some water was removed from each of 6 tanks.If the standard deviation of volumes of water in the tanks at the beginning of the experiment was 10 gallons,waht is the standard deviation of the volumes of water at the end of experiment?
(1)for each tank,30% volume of water that is in the tank at the beginning of the experiment was removed during the experiment
(2)the average volume of water in the tanks at the end of the experiment was 63 gallons.
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