According to empirical rule, the standard deviation and mean interval – McqOptions

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1.	According to empirical rule, the standard deviation and mean interval that covers approximately 68.27% of data from a frequency distribution is
A.	μ±σ
B.	2μ±2σ
C.	3μ±2σ
D.	4μ±4σ
Answer» B. 2μ±2σ

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