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A group has 250 items with mean and standard deviation equal to 15.6 and √13.44 respectively. If the second group of two samples has 100 items with mean equal to 15 and standard deviation equal to 3, then the standard deviation of first group is

Answer» A group has 250 items with mean and standard deviation equal to 15.6 and 13.44 respectively. If the second group of two samples has 100 items with mean equal to 15 and standard deviation equal to 3, then the standard deviation of first group is


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