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The standard deviation of n observation ...

The standard deviation of n observation `x_(1),x_(2),……x_(n)` is 6. The standard deviation of another set of n observations `y_(1),y_(2),………..y_(n)` is 8. What is the standard deviation of n observations `x_(1)-y_(1),x_(2)-y_(2),………..,x_(n)-y_(n)`?

A

10

B

Data insufficient

C

14

D

2

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