For a group containing 100 observations, the mean and standard deviation are 8 and \( \sqrt{10.5...

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For a group containing 100 observations, the mean and standard deviation are 8 and \( \sqrt{10.5} \). For 50 observations selected from these 100 , the mean and standard deviation are 10 and 2 respectively. Find the arithmetic mean and standard deviation of the other half.
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