1. The Environmental Department monitors sulphur dioxide (SO2) emission of ABC
powerplant every hour. Assume the concentration of SO, from ABC powerplant is normal
distributed. The powerplant claims that the average SO2 emission is 75 ppb (parts per
billion) and the standard deviation is 0.75 ppb. The Environmental Department set the
standard of SO2 concentration for all powerplants is 77 ppb.
(a) Find the probability that the powerplant will exhaust more than the standard.
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