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Answer the following questions, which he...

Answer the following questions, which help you understand the difference between Thomson’s model and Rutherford’s model better.
In which model is it completely wrong to ignore multiple scattering for the calculation of average angle of scattering of a-particles by a thin foil?

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In Thomson.s model, a single collision causes very little deflection. Hence, the observed average scattering angle can be explained only by considering multiple scattering, hence it is wrong to ignore multiple scattering in Thomson.s model. In Rutherford model scattering is mainly due to single collisions and many scattering can be ignored as the first approximation.
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