ABSTRACT
According to the Environmental Protection Agency, “polycyclic aromatic hydrocarbons are a group of over 100 different chemicals that are formed during the incomplete burning of oil, gas, coal, garbage, or other organic substances like tobacco or charbroiled meat and from motor vehicle exhaust.” Prior to submitting a bid for a construction job, cost engineers prepare a detailed analysis of the estimated labor and materials costs required to complete the job. A company that stamps gaskets out of sheets of rubber, plastic, and other materials wants to compare the mean number of gaskets produced per hour for some different types of stamping machines. A manufacturer whose daily supply of raw materials is variable and limited can use the material to produce two different products in various proportions. In a manufacturing process, a plastic rod is produced by heating a granular plastic to a molten state and then extruding it under pressure through a nozzle.
