The dot plots below show students' typing speed at the beginning and end of a typing course. SELECT ALL the statements that are true about the dot plots below... 1. Overall, the students improved by the end of the course.

2. There are 20 students enrolled in the course.

3. The center of the data is 20 words per minute for both dot plots.

4. The center of the end of course dot plot is about 27 wpm.

5. The range of beginning of course data is 20 wpm.