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Given the following data of sound pressure levels measured at equal intervals:60dB, 62 dB, 63 dB, 59 dB, 60 dB, 80 dB, 58 dB, 59 dB, 65 dB, 57 dB, 62 dB. The value of the background noise level (L90) is :

A 62.5 dB

B 57 dB

C 61 dB

D 58 dB

Answer & Explanation
Answer:58 dB