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In a given stock portfolio consisting of thousands of stocks, the average price of stocks is $80 and the standard deviation is $25. A

In a given stock portfolio consisting of thousands of stocks, the average price of stocks is $80 and the standard deviation is $25. A random sample of 40 stocks are selected. What is the probability that the sample mean of the price of those 40 stocks would be below $857 (Provide four decimal places).

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