已知9个数的平均数是72,去掉一个数后,余下的数平均数为78,去掉的数是______.
人气:310 ℃ 时间:2019-11-13 06:31:21
解答
9个数的和:72×9=648,
余下的8个数的和:78×8=624,
去掉的数是:648-624=24.
答;去掉的数是24.
故答案为;24.
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