2.2 A veteran rock drill operator who has been exposed to about 112dB noise during his 25 year working career has his ears tested. The audiometer records the following hearing loss for his ears measured in dB. Left Ear Right Ear Frequency Hertz 30 45 55 65 60 a) Calculated his binaural Hearing Impairment b) Does he have a permanent disability? 2398228 30 125 250 500 1000 2000 4000 800

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