a. What is the probability of a monthly exposure between 4 and 6 ug/m? b. What is the probability of a monthly exposure thatis at least 7.3 ug/m3 c. What is the probability of a monthly exposure that is less than 6.9 ug/m

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4. A study by Bechtel et al., 2009, described in the Archives of Environmental & Occupational Health
considered polycyclic aromatic hydrocarbons and immune system function in beef cattle. Some cattle
were near major oil- and gas-producing areas of western Canada. The mean monthly exposure to
PM1.0 (particulate matter that is < 1µm in diameter) was approximately 7.1 ug/m3 with standard
deviation 1.3. Assume that the monthly exposure is normally distributed. NOTE: Draw the standard
normal curve for each item below.
a. What is the probability of a monthly exposure between 4 and 6 ug/m?
b. What is the probability of a monthly exposure thatis at least 7.3 ug/m³
c. What is the probability of a monthly exposure that is less than 6.9 µg/m
Transcribed Image Text:4. A study by Bechtel et al., 2009, described in the Archives of Environmental & Occupational Health considered polycyclic aromatic hydrocarbons and immune system function in beef cattle. Some cattle were near major oil- and gas-producing areas of western Canada. The mean monthly exposure to PM1.0 (particulate matter that is < 1µm in diameter) was approximately 7.1 ug/m3 with standard deviation 1.3. Assume that the monthly exposure is normally distributed. NOTE: Draw the standard normal curve for each item below. a. What is the probability of a monthly exposure between 4 and 6 ug/m? b. What is the probability of a monthly exposure thatis at least 7.3 ug/m³ c. What is the probability of a monthly exposure that is less than 6.9 µg/m
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