This is from big ideas You and a group of friends want to know how many students in your school prefer pop music. There are 840 students in your school. Each person in the group randomly surveys 20 students. The table shows the results.
Favorite Type of Music
Country Pop Rock Rap
You 2 13 4 1
Friend A 3 8 7 2
Friend B 4 10 5 1
Friend C 5 10 4 1
Friend D 5 9 3 3

Use each sample to make an estimate for the number of students in your school who prefer rock music.

You Friend A Friend B Friend C Friend D
Estimate

Describe the center and the variation of the estimates.

Median:
students

Range:
students