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.
a. Approximately 68% of data falls within 2 standard deviations (±2) of the mean.
This statement is true because according to the empirical rule or the 68-95-99.7 rule, approximately 68% of the data falls within the range of ±2 standard deviations from the mean in a normally distributed dataset.