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The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper is normally distributed with a population mean of 320

The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper is normally distributed with a population mean of 320 and a population standard deviation of 20 inches. For a randomly chosen Monday, what is the probability that there will be less than 340 column inches of classified advertisement? Answer as a probability to two decimal places.

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