There are 20 classes at each of two middle schools. The number of students in each class at each school is shown in the dot plots below.

Number of Students in Each Class at Poplar Middle School
A dot plot titled Number of Students in Each Class at Poplar Middle School. A number line going from 20 to 29 labeled Number of students. There are 3 dots above 20, 5 above 21, 7 above 22, 4 above 23, 1 above 24, and 0 above 25, 26, 27, 28, and 29.

Number of Students in Each Class at Oak Middle School
A dot plot titled Number of Students in Each Class at Oak Middle School. A number line going from 20 to 29 labeled Number of students. There is 1 dot above 20, 2 above 21, 2 above 22, 4 above 23, 3 above 24, 2 above 25, 2 above 26, 2 above 27, 1 above 28, and 1 above 29.

What is the difference between the medians in the dot plots?
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