I need help with the attached file.

Key

s=3{[a]} = 34 km/h

s=8{[d]} = 87 km/h

y The area of a region under a curve is greater than the area of an inscribed rectangle and less 10(9) than the area of a circumscribed rectangle. Intuitively, we understand that somewhere "between\" the inscribed and circumscribed rectangles there is a rectangle whose area is precisely equal to the area of the region under the curve: f:f(m)dm = f(c)(ba,) The average value of a function on the interval [0,; b] is determined by 1 b Average value = E fa f (as) do: The efciency 8 (in % ) of an automobile engine is given by e = 0,7683 _ 0.0000433 ,where s is the speed (in km/ h) of the car. Find the average efciency with respect to the speed for s : 3{[a]} km/h to s : 8{[d]} km/h. Round the answer to one decimal place