Final answer:
A normal distribution is a unique data set with a symmetric distribution. Skewed left and skewed right distributions are asymmetric and have a longer tail on one side. A bimodal distribution has two distinct modes or peaks.
Step-by-step explanation:
A unique data set with a symmetric distribution is a normal distribution. It is symmetrical because a vertical line can be drawn at the mean, and the shape on the left and right of the line are mirror images of each other.
A skewed left distribution is asymmetric, and the left side is pulled out. This happens when there are more high values on the right side.
A skewed right distribution is also asymmetric, but the right side is pulled out. This occurs when there are more high values on the left side.
A bimodal distribution has two distinct modes or peaks, which means there are two different values that occur most frequently in the data set.