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The second group of two samples has 100 items with mean 15 and S.D=3.If the whole group has 250 items with mean 15.6 and S.D=√13.44, then S.D of first group is |
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Answer» The second group of two samples has 100 items with mean 15 and S.D=3.If the whole group has 250 items with mean 15.6 and S.D=√13.44, then S.D of first group is |
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