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 of39.5hours after the last drink, with a standard deviation of19

hours. A sample of38people 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 be37.5hours or less?

Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.