The first of the two samples has 100 items with mean 15 and \(\mathrm{S}.\mathrm{D}.3\). 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

[JEE Main 2021, 25 Jul (Shift 2)]

Question

The first of the two samples has 100 items with mean 15 and \(\mathrm{S}.\mathrm{D}.3\). 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

[JEE Main 2021, 25 Jul (Shift 2)]

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The first of the two samples has 100 items with mean 15 and \(\mathrm{S}.\mathrm{D}.3\). If the whole group has 250 item…

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