A cross-section of an airplane wing is shown. Measurements of the thickness of the wing, in centimeters, at 16-centimeter intervals are 6.1, 19.9, 26.7, 29.0, 27.2, 27.5, 23.6, 20.9, 15.8, 9.1, and 3.2. Use the Midpoint Rule with n = 5 to estimate the area of the wing's cross-section if a = 160. (Assume the thickness of the edges is nonzero.)

Answer has to be in cm^3