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 ofhours after the last drink, with a standard deviation ofhours. A sample ofpeople 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 behours or less?

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