At a concert, the number of tattoos, x, and the number of piercings, y, that a person had was recorded. The data appear as (x,y):

(2,5)

(8,7)

(5,6)

(3,4)

(6,8)

Calculate r, rounded to the nearest hundredth. Note: If you're using your calculator, put the x-values of the points in List1, and the y-values in List2.