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Which statement is true of normally distributed data?
A. Approximately 90% of data falls within 2 standard deviations (± 2) of the mean
B. Approximately 90% of data falls within 3 standard deviation (± 3) of the mean
C. Approximately 95% of data falls within 2 standard deviations (± 2) of the mean
D. Approximately 95% of data falls within 3 standard deviation (± 3) of the mean

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Answered by GPT-5 mini AI
C. Approximately 95% of data falls within 2 standard deviations (±2) of the mean — this is the empirical (68–95–99.7) rule for normal distributions.