Air samples for worker's exposure to oil mist were found to indicate the followir levels in Table 1. Calculate TWA. Table 1 Sample Measured Amount Time of Sample 3 mg/m 28 mg/m' Sample I 2 hours Sample 2 6 hours (a) 6.57 mg/m' 6.75 mg/m 54 mg/m (b) (c) 31 maán3
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- To seethe effect of a relatively small error in the estimate of the amountof carbon-14 in a sample being dated, consider this hypotheticalsituation: A bone fragment found in central Illinois in the year 2000 contains 17% of its original carbon-14 content. Estimate the year the animal died.Calculate the average values of the Cp and Cpk capabil-ity indices for the BOD data , assuming that LSL=5 mg/L and USL=35 mg/L. Do these val-ues of the indices indicate that the process performance is satisfactory?A worker with a weight of 65 kg and a body surface area of 1.74 , performs physical work activities in several work environments as shown in the following table. The work activities of these workers require energy and a measured metabolic rate of 400 W/m2. During their work activities, the worker wears a coverall made of polyolefin and wears a headgear (1) Calculate the average WBGT of the work environment. (2) Perform an analysis related to the heat stress experienced by the worker, if the worker performs his work activities for 75% of his total working time and the rest is rest, (note: use TLV from ACGIH and ISO 7243)
- your car is more crowded than you think. table 5.8 reports results from a 1969 personal transportation survey on "home-to-work" trips in metropolitan areas. show that the average number of riders in the car of a typical commuter is 1.9.(a) Calculate a 95% two-sided CI for the true average bond strength. (b) Calculate a 95% two-sided CI for the proportion of all such bonds whosestrength values would exceed 10. show major intermediate steps.Your state is considering raising the legal age for consumption of alcoholic beverages to 21 years old. How large a sample suze must be taken to make an estimate of true proportion of citizens who favor this move? The error should be no more than .01 with 99% confiden
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- The EPA Risk Management Plan (RMP) defines a worst-case scenario as the catastrophic release of the entire process inventory in a 10min period (assumed to be a continuous release). The dispersion calculations must be performed assuming F stability and 1.5 m/s wind speed. As part of the RMP rule, each facility must determine the downwind distance to a toxic endpoint. These results must be reported to the EPA and to the surrounding community. A plant has a 100lb tank of anhydrous hydrogen fluoride. The toxic endpoint is specified in the RMP as 0.016 mg/L. Consider the EPA worst case release scenario described above (assume rural conditions) and consider in particular the footprint of the toxic cloud at ground level. (1) Determine the size of the toxic cloud in the downwind direction. (2) Determine the maximum thickness of the toxic cloud in the crosswind directionAn assemb ly-line worker at Joseph Milner'sFabrication Shop inserts Pa rt A into Part B. A time study wasconducted and produced the fo llowing results in seconds: 8.4, 8.6,8.3, 8.5, 8.7, 8.5. What is the average cycle time?A random sample of 25 tires gave the average life as 38000 km and S.D. as 5000 km. Can it be concluded that the sample is drawn from a population with a mean life of 40000 km?