3. The alkalinity level of water specimens collected from a certain river is approximately distributed as normal with a mean of 50 miligrams per liter and a standard deviation of 2.5 miligrams per liter. i. Find the probability that a water specimen collected from the river has an alkalinity level below 54 miligrams per liter. ii. If a sample of 20 specimens are collected from the river, what is the probability that the mean alkalinity level is between 49.5 and 51.5 miligrams per liter? Answer

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