GRE

简答题 For this question，write your answer in thebox．
The numbers 4，x，5，4，x，9，7，and 5 have amean of 6．Find x．


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3 When company X ships a dozen eggs，there is a 3%chance that exactly oneegg will be broken，a 0．5%chance that the whole dozen will bebroken，butno chance that any other number of eggs willbe broken．If 1，000 dozeneggsare ordered from company X．how many broken eggsshould be expected?

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