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Suppose the sound pressure level of each of three individual noise sources is measured at a point such that with each source running individually, the

Suppose the sound pressure level of each of three individual noise sources is measured at a point such that with each source running individually, the sound pressure ia as follows, source 1- 88dB, source 2- 86dB, source 3- 91dB. What is the sound pressure level with all three running?

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