The shape of the distribution of the time required to get an oil change at a 15​-minute ​oil-change facility is unknown.​ However, records indicate that the mean time is 16.4 minutes​, and the standard deviation is 4.3 minutes.   What is the probability that a random sample of n=40 oil changes results in a sample mean time less than 15 ​minutes?   The probability is approximately enter your response here. ​(Round to four decimal places as​ needed.)

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