PRC-2 · Chapter 11 · Question 21 of 60
In a perfectly symmetrical Normal Distribution, what specific percentage of observations theoretically fall within ±1 Standard Deviation of the mean?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) Approximately 68%
Explanation
According to the Empirical Rule (68-95-99.7 rule), about 68% of the area under a normal curve is located within one standard deviation of the average.
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