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The first of the two samples have 100 it...

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. = sqrt13.44` then S.D. of the second group is

A

3

B

2

C

4

D

5

Text Solution

Verified by Experts

The correct Answer is:
C
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