Given a normally distributed variable with a mean of 70 and a standard deviation of 10, which of the following is the most appropriate statement?
A. 50% of all cases fall within one standard deviation of the mean.
B. Approximately 95% of all cases fall within the range 60 to 80.
C. Approximately 68% of all cases fall within the range 60 to 80.
D. None of the above is correct.
C.
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