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The annual rainfall amount at one region follows normal distribution with mean of 110 cm and standard deviation=18 = 18 cm.1(4). For a randomly selected

The annual rainfall amount at one region follows normal distribution with mean of 110 cm and standard deviation=18

cm.1(4). For a randomly selected year, find the probability that the annual rainfall amount is less than 85 cm.

2(5). For a sample of 5 randomly selected years, find the probability that the sample average annual rainfall amount is between 120 cm and 130 cm.

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