The average of a set of six integers is 3When a seventh number is included in the set, the average of the set increases to 4What

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问题 The average of a set of six integers is 3When a seventh number is included in the set, the average of the set increases to 4What is the seventh number?

选项

答案101

解析 The correct answer is 101. If the average of the six integers is 38, then the total must be 6x38 = 228. If the average of the seven integers is 47, then the total must be 7x47 = 329. You are adding the seventh integer to the set, so the value of the seventh integer will be 329-228 = 101.

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The average of a set of six integers is 3When a seventh number is included in the set, the average of the set increases to 4What

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