The Mean Is Especially Useful When the Data Are What

Multiple Choice

The mean is especially useful when the data are what statisticians call "normally distributed." This means :

A) if you graphed the data, it would form a shape similar to a bell curve.
B) values are placed into numerical order, and the middle value is determined.
C) the data falls within the "fiftieth percentile."
D) the distribution of a group is how spread out it is, or how dispersed the data are.