SOLUTION: 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 40.5

Question 1128733: 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 40.5
hours after the last drink, with a standard deviation of 17
hours. A sample of 40
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 39
hours or less?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
z<=(xbar-mean)/sigma/sqrt(n) since the mean and sd are known.
z<(39-40.5)/17/sqrt(40) or z< -1.5*sqrt(40)/17 or z < -0.56. That probability is 0.2877
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