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.=13.44 then S.D. of the second group is

Question

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

5

4

6

3.52

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