Final answer:
Without explicit values for force and area, it is not possible to determine the maximum average shear stress for the thin-walled section of a beam. Additional information is necessary to provide an accurate answer.
Step-by-step explanation:
The question pertains to the calculation of shear stress in a beam's thin-walled section. To arrive at an answer, one needs to use the formula for shear stress, which is τ = F/A, where τ represents the shear stress, F is the force applied, and A is the cross-section area perpendicular to the force. Without specific values given for force and area in the question, one cannot determine which of the provided options (7.5 MPa, 30 MPa, 15 MPa, or 0 MPa) is correct for the maximum average shear stress.
Additionally, information provided on shear modulus, compressive stress, ultimate stress, and deformation is not directly applicable for deducing the exact value of shear stress. Therefore, the answer to this question cannot be confidently provided without additional information on the force and area for the specific thin-walled section mentioned.