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Alcohol withdrawal occurs when a person who uses alcohol excessively suddenly stops the alcohol use. Studies...

Alcohol withdrawal occurs when a person who uses alcohol excessively suddenly stops the alcohol use. Studies have shown that the onset of withdrawal is experienced a mean of 40
hours after the last drink, with a standard deviation of 18
hours. A sample of 38
people who use alcohol excessively is to be taken. What is the probability that the sample mean time between the last drink and the onset of withdrawal will be 40.2
hours or less?
Math   Statistics-And-Probability   
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