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Q4. (Exercise 1.35) Alkalinity of water. 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 (Environmental Science and Engineering, September 1, 2000). Assume the distribution of alkalinity levels is approximately normal. Find the probability that a water specimen collected from the river has an alkalinity level (a) exceeding 45 milligrams per liter. (0.5 pt) (b) below 55 milligrams per liter. (0.5 pt) (c) between 51 and 52 milligrams per liter. (0.5 pt)

math   Statistics-And-Probability   
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Answer #1

X ~ normal ( mu =50,sigma=3.2)

32 J 0 9406 3-2 o. 9Li06 3.2 3.2 O 11

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