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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 |
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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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