Note that while the figure is made up of rectangle and parallelogram, then the area of this figure

1. The area of rectangle is

The vertices of rectangle are points A(-2,-2), B(0,-6), C(8,-2) and F(6,2). Then

Therefore,

2. The area of parallelogram can be calculated using formula

The base of parallelogram is segment CD with length
and the height has length 2 un. Then

3. Now

Answer:
Get a list of all the music students in the eighth grade. Randomly select enough students to get a sample from the population. Ensure that the selection is completely random so the sample is not biased.