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A Question of engineering about Sound. How to calculate in step by step? Thank you.

The octave bands¡¦ Sound pressure levels in dB re 20 £g Pa are:
Hz 57 129 220 420 1K 2K 4K 8K
dB 85 95 90 80 88 70 68 72

What is the overall A-weighted sound pressure level?

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