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A certain set of 100 numbers has an average (arithmetic mean) of 10 and a standard deviation of x, where x is positive. Which of the following pairs of numbers, if added to the set, must reduce the standard deviation?

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A certain set of 100 numbers has an average (arithmetic mean) of 10 and a standard deviation of <em>x</em>, where <em>x</em> is positive. Which of the following pairs of numbers, if added to the set, must reduce the standard deviation?






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