The mean, median, and mode of a distribution are
a) measures of central tendency
b) measures of variability
c) types of transformed scores
d) types of deviations

The answer to the question is, D) Types of deviations.

The mean, median, and mode of a normal distribution are equal. The area under the normal curve is equal to 1.0. Normal distributions are denser in the center and less dense in the tails. ... 68% of the area of a normal distributionis within one standard deviation of the mean.