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[" The first of two samples has "100" it...

[" The first of two samples has "100" items with mean "15" and standard deviation "3." If the whole group "],[" has "250" items with mean "15.6" and standard deviation "sqrt(13.44)" then standard deviation of second "],[" group is "]

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The first of two samples has 100 times with mean 15 and standard deviations 3. If the whose group has 250 items with mean 15.6 and standard deviation sqrt(3.44) Find the standard deviation of the second group.

The first of the two samples have 100 items with mean 15 and S.D.3. If the whole group has 250 items with mean 15.6 and S.D.=sqrt(13.44) then S.D. of the second group is

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