Define the normal distribution. Be sure to include key concepts like the middle score, and what happens to the frequencies as you move out toward the tails.

A) The normal distribution is skewed, with higher frequencies at the tails.
B) The middle score is the mean, and frequencies decrease symmetrically as you move away from the mean.
C) The normal distribution is uniform, with equal frequencies across all scores.
D) The middle score is the mode, and frequencies increase exponentially toward the tails.