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The first of two samples has 100 items...

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 standrd deviation `sqrt(13.44)` then standard deviation of second group is

A

4

B

3

C

6

D

2

Text Solution

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The correct Answer is:
A
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