Airplane wing pressure difference

Question

The wing of an airplane has an average cross-sectional area of 11 m² and experiences a lift force of 124,613 N. What is the average difference in the air pressure between the top and bottom of the wing (in N/m²)?

I divided using P=F/A and got 1.13e+4 (using scientific notation to 3 significant digits.) And was marked incorrect.

Answer 1

What the question is asking for is the difference in pressure between the top and bottom of the wing surface. What you calculated is the pressure on the bottom surface of the wing.

In order to calculate the average pressure difference between the top and bottom of the wing, you would need to know the pressure on the top surface of the wing as well. I am not sure how to determine the pressure on the top surface of the wing except to say that it is lower than the bottom surface so that there is a net upward force on the wing.