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Suppose that an investment portfolio selected by randomly throwing darts at the stock market page of the Wall Street Journal may be a sound investment.Suppose

Suppose that an investment portfolio selected by randomly throwing darts at the stock market page of the Wall Street Journal may be a sound investment.Suppose that you own such a portfolio of 19 stocks randomly selected from all stocks listed on the New York Stock Exchange.On a certain day, the average stock rose by 3.0 points.Assume that stock price movements are normally distributed with a mean 4.0 points and standard deviation 3 points.What is the probability that the portfolio decreased in price?

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