Suppose the following information was collected, where x=diameter of tree trunk in inches, and y=tree height in feet
x 4 2 8 6 10 6
y 8 4 18 22 30 8
If the LSRL equation is y=-3.6 + 3.1x, what is your estimate of the average height of all trees having a trunk diameter of 7 inches?
A) 18.1
B) 19.1
C) 20.1
D) 21.2
E) 22.1