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The value in dollars of a certain stock at the end of the month approximately follows...

The value in dollars of a certain stock at the end of the month approximately follows a normal distribution with mean 11 and standard deviation 2.5. An investor will buy the stock at the end of the month if its price is no higher than $6. Use the 68-95-99.7 Rule to estimate the percentage of times that the investor would buy the stock.

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