Over the workday, a worker is exposed to a noise level of 90 dBA for 4 hr,

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Over the workday, a worker is exposed to a noise level of 90 dBA for 4 hr, 92 dBA for 2.5 hr, and 100 dBA for 1.5 hr.
a. Find the daily exposure.
b. Does this exposure exceed the OSHA permissible exposure limit (PEL)?

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