The dotplot below displays the number of math classes taken by a random sample of students at a high school.

A dotplot titled Math Classes. A number line going from 2 to 6 is labeled number of math classes taken. 2, 1; 3, 6; 4, 18; 5, 7; 6, 1.

Which of the following is the best description of the shape and center of the dotplot?

The distribution of math classes is skewed left with a center around 4 classes.
The distribution of math classes is skewed left with a center between 3 and 4 classes.
The distribution of math classes is unimodal symmetric with a center around 4 classes.
The distribution of math classes is unimodal symmetric with a center between 3 and 4 classes.