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Which statement is true of normally distributed data?
A. Approximately 68% of data falls within 2 standard deviations (± 2) of the mean
B. Approximately 68% of data falls within 1 standard deviation (± 1) of the mean
C. Approximately 75% of data falls within 2 standard deviations (± 2) of the mean
D. Approximately 75% of data falls within 1 standard deviation (± 1) of the mean

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Answered by GPT-5 mini AI
B. Approximately 68% of data falls within 1 standard deviation (±1) of the mean.

(For a normal distribution the empirical rule is ~68% within ±1σ, ~95% within ±2σ, and ~99.7% within ±3σ.)