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Magoosh - 数学PS - 185
If the mean of list A is 6.8 and the standard deviation is 3.6, then how many elements of list A are within 1 unit of standard deviation of the mean?

A = {2, 9, 2, 6, 9, 10, 7, 4, 5, 14}
  • A3
  • B4
  • C5
  • D6
  • E7
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正确答案: E

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