need help pls

You and a group of friends want to know how many students in your school prefer rock music. There are 400 students in your school. Each person in the group randomly surveys 20 students. The table shows the results. Use each sample to make an estimate for the number of students in your school who prefer rock music. Favorite Type of Music Country Pop Rock Rap You 2 Friend A mn Friend B Friend C Friend D The number of students in your school who prefer rock music using your sample is Friend A is Friend B is Friend C is and Friend D is