Find the Exact Coordinates of the Centroid $$y = e ^ { 3 x } , y = 0 , x = 0 , x = \frac { 1 } { 3 }$$

Find the exact coordinates of the centroid.
$$y = e ^ { 3 x } , y = 0 , x = 0 , x = \frac { 1 } { 3 }$$