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The alkalinity level of water specimens collected from the Han River in Seoul, Korea, has a mean of 50 milligrams per liter and a standard deviation of 3.2 milligrams per liter. Assume the distribution of alkalinity levels is approximately normal and find the the probability that a water specimen collected from the river has a alkalinity level below 55 milligrams per liter.

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Category:- Statistics and Probability
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