A wоrker wаs expоsed tо inorgаnic leаd dust at 7 mg/m3 for 3.0 hrs, at 6 mg/m3 for 4 hrs, and 9.2 mg/m3 of dust for 1.0 hrs. What was the TWA? If the company is adopting TLV (50 µg/m3) as standard for inorganic lead, was the exposure in compliance, and why? The inorganic lead has 207.2 g/mol. What's the TWA in ppm? Show your step-by-step calculation process and include appropriate unit for credits. Formula includes TWA and PPM