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A study by Bechtel et al., 2009, described in the Archives of Environmental & Occupational Health...

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Basic Math

A study by Bechtel et al., 2009, described in the Archives ofEnvironmental & Occupational Health considered polycyclicaromatic hydrocarbons and immune system function in beef cattle.Some cattle were near major oil- and gas-producing areas of westernCanada. The mean monthly exposure to PM1.0 (particulate matter thatis <1μm in diameter) was approximately 7.2 μg/m3 with standarddeviation 1.5. Assume that the monthly exposure is normallydistributed.

a. What is the probability of a monthly exposure greater than 9μg/m3?

b. What is the probability of a monthly exposure between 3 and 5μg/m3?

c. What is the monthly exposure level that is exceeded withprobability 0.05? d. What value of mean monthly exp

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