Approximately 68 percent of the cases represented by the normal curve fall within ________ standard deviation(s) of the mean.

A) 1
B) 2
C) 3
D) 34

Normal Curve

A symmetrical, bell-shaped curve representing the distribution of a set of data where most occurrences fall near the average, and fewer are found the farther one moves away from the mean.

Standard Deviation

Standard deviation is a statistical measure that quantifies the amount of variation or dispersion of a set of data values from the mean (average) of the data set.