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Sovle sound pressure level

An acoustical Engineer was hired to make a series of sound level measurements at the site of a proposed industrial operation. The sound level meter was used to measure three levels at the same position. The engineer failed to reset the sound level meter between measurements 2 and 3 so that measurement 3 was actually the average (log mean) sound pressure level of the second and third measurements. The measurements are as follows: Lp1 = 84.0 dB Lp2 = 85.0 dB Lp3 = 87.3 dB What is the true sound pressure level reading for the third measurement?

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answered by: ANURANJAN SARSAM
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