PS5_ChE 230_assign_10

# PS5_ChE 230_assign_10 - ChE 230 Spring 2010 Problem Set 5...

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ChE 230 Spring 2010 Problem Set 5 – 03/02/10 – 03/09/10 1. Years of operating data suggest that the time to run a batch reaction to completion is distributed normally with µ = 1.86 hr and σ = 1.25 min. a. What is the probability that the reaction time of the next batch will not exceed 1.86 hr? b. What is the probability that the reaction time of the next batch will exceed 1.89 hr? c. What is the probability that the reaction time of the next batch will be between 1.80 and 1.90 hr? 2. The Occupational Safety and Health Administration (OSHA) sets a maximum permissible exposure limit (PEL) for chemicals that they believe are hazardous. Air samples are taken and analyzed at an independent laboratory using OSHA approved procedures. Therefore, OSHA believes that the results of this procedure are unbiased. The legal standard is a 95% confidence for these cases. This means that for samples taken by the company and sent out for analysis, the OSHA standard is considered met if there is a 95% chance that air was below the PEL. However, OSHA needs data that there is a 95%

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## This note was uploaded on 05/14/2010 for the course CHE 230 taught by Professor Stinespring during the Spring '10 term at WVU.

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PS5_ChE 230_assign_10 - ChE 230 Spring 2010 Problem Set 5...

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