in the dorben company, an industrial engineer was assigned to alter the work met

Question

in the dorben company, an industrial engineer was assigned to alter the work methods in the press department to meet osha standards relative to permissible noise exposures. the ie found a time weighted average sound level of 100 db. the 20 operators in this department wore earplugs provided by dorben with an nrr value of 20 db. what improvement resulted? do you feel that this department is now in compliance with the law?

I have the answer for the new noise level, which is 87 decibels. I don't know how to get the number and would appreciate the help. Thanks in advance!

Explanation / Answer

Nrr value = unprotected noise level - protected noise level - 3 dB So protected noise level = 100 - 20 -3 =77 dB Not 87

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