First make sure you watch the last video lesson at "3.3 Risk Assessment Process: Steps 2 and 3". Taking the data from the above example. Let's consider a new scenario for a custodian who works at the school. Calculate the asbestos cancer risk of a custodian who works 8 hrs per day for 250 days per year for 30 years at an air level of 0.01 f/ml. As presented in the video, start with the risk of 1 death @ 0.0004 f/ml per lifetime exposure (i.e. 24/7 for 70 years) and work your way down. Assume everything is a linear response. (show all work and calculations)