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