Use the image to answer the question.
An illustration shows a number line ranging from 4 to 12 in one unit increments. Each number is labeled and represented with a tick mark. A box plot is placed above the number line. The box is divided into two sections.
The first section of the box plot extends from 7.5 to 8.5. The second section of the box plot extends from 8.5 to 10.5. A line starts at the left side of the first section of the box plot and extends from 7.5 to 4, where it ends with a short vertical line. Another line starts at the right side of the second section of the box plot and extends from 10.5 to 12, where it ends with a short vertical line.
Devin constructs this box plot to show the number of T-shirts his friends own.
According to the information given in the box plot, what is the range of the dataset?