<span>"how many more students in a class of 270 students would be expected to choose country than rock?"</span>
In order to answer this question, we need to know how many students choose <span>country, and </span>how many students choose rock
From the graph, we could read that 30 students choose country, and 20 students choose rock.
So that, the difference between these two number is 30-20= 10 more students choose country than rock
But the students' number is 270, not 90 as is in the graph
so we would multiply our result by 3 to get the right number of students
10*3=30 students
I hope that
helps!