Question

A company's manufacturing process uses 500 gallons of water per cycle. A "scrubbing" machine then removes most of a chemical pollutant before pumping the water into a nearby lake. To meet federal regulations, the treated water must not contain more than 80 parts per million (ppm) of the chemical. Because a fine is charged if regulations are not met, the company sets the machine to attain an average concentration in its output of 75 ppm per 500-gallon cycle. The concentration of the chemical in the scrubbing machine's output per 500-gallon cycle can be described by a normal model with standard deviation 4.2 ppm. What percent of the batches of water discharged by the machine would be expected to exceed the 80 ppm standard? Select one or more: a. 1.17% b. 88.3% c. 8.83% d. 3.89% e. 11.7%

          A company's manufacturing process uses 500 gallons of water per cycle. A "scrubbing" machine then removes most of a chemical pollutant before pumping the water into a nearby lake. To meet federal regulations, the treated water must not contain more than 80 parts per million (ppm) of the chemical. Because a fine is charged if regulations are not met, the company sets the machine to attain an average concentration in its output of 75 ppm per 500-gallon cycle. The concentration of the chemical in the scrubbing machine's output per 500-gallon cycle can be described by a normal model with standard deviation 4.2 ppm. What percent of the batches of water discharged by the machine would be expected to exceed the 80 ppm standard?
Select one or more:
a. 1.17%
b. 88.3%
c. 8.83%
d. 3.89%
e. 11.7%

A company's manufacturing process uses 500 gallons of water per cycle. A "scrubbing" machine then removes most of a chemical pollutant before pumping the water into a nearby lake. To meet federal regulations, the treated water must not contain more than 80 parts per million (ppm) of the chemical. Because a fine is charged if regulations are not met, the company sets the machine to attain an average concentration in its output of 75 ppm per 500-gallon cycle. The concentration of the chemical in the scrubbing machine's output per 500-gallon cycle can be described by a normal model with standard deviation 4.2 ppm. What percent of the batches of water discharged by the machine would be expected to exceed the 80 ppm standard?
Select one or more:
a. 1.17%
b. 88.3%
c. 8.83%
d. 3.89%
e. 11.7%

Added by Valerie M.

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