34. 2927-!-item-!-187;#058&003024 During an experiment, some water was removed from each of 6 water tanks. If the standard deviation of the volumes of water in the tanks at the beginning of the experiment was 10 gallons, what was the standard deviation of the volumes of water in the tanks at the end of the experiment? (1) For each tank, 30 percent of the volume of water that was in the tank at the beginning of the experiment was removed during the experiment. (2) The average (arithmetic mean) volume of water in the tanks at the end of the experiment was 63 gallons. 這題我看了一下PP1DS的詳解 他寫的內容好像變成這6個桶子都是一樣大小的 但是我從題目中一直找不到他有寫說這些桶子是一模一樣的 想請問版上的大大 是我會錯意呢?? 還是怎樣了?? 或請有大大開點一下 ^^" THX~~~! --

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