题目信息
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}
A = {2, 9, 2, 6, 9, 10, 7, 4, 5, 14}
A:3
B:4
C:5
D:6
E:7
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正确答案:
E:7
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题目来源
Magoosh