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Paving stones: 150 paving stones were examined for cracks, and 9 were found to be...

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Paving stones: 150 paving stones were examined for cracks, and 9 were found to be cracked. The same 150 stones were examined for discoloration, and 23 were found to be discolored. A total of 8 stones were both cracked and discolored. One of the 150 stones is selected at random. Round all answers to four decimal places.

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