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If X Is Normally Distributed with Mean μ and Standard

Question 83

Multiple Choice

If X is normally distributed with mean μ and standard deviation σ,then what is the approximate probability that μ - 2σ ≤ X ≤ μ + 2σ?

A) 0.5
B) 0.68
C) 0.95
D) 0.997
E) 0.999

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