A stock market analyst examined the performance of the shares of a large number ofcorporations. When the performance of these stocks was investigated year later, it turned out that 25 % performed much better than the market average ; 25 % performed much worse ; and remaining shares performed about the same as the average . 40% of the stocks that performed much better than the market average were rated as " good buys ” by the analyst ; as were 20 % of those that did about as well as market average and 10 % of those that did much worse than market average . What is the probability that a stock rated as “ good buys ” by the analyst performed much better than theaverage ?

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A stock market analyst examined the performance of the shares of a large number ofcorporations. When the performance of these stocks was investigated year later, it turned out that 25 % performed much better than the market average ; 25 % performed much worse ; and remaining shares performed about the same as the average . 40% of the stocks that performed much better than the market average were rated as " good buys ” by the analyst ; as were 20 % of those that did about as well as market average and 10 % of those that did much worse than market average . What is the probability that a stock rated as “ good buys ” by the analyst performed much better than theaverage ?

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