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

Question

Quizplus · Accepted Answer

This probability represents the range of values that lie within 2 standard deviations of the mean, which is approximately 95% for a normally distributed variable. Therefore, the answer is (C) 0.95.

If X Is Normally Distributed with Mean μ and Standard