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Let a(1),a(2),...a(10) be "10" observati...

Let `a_(1),a_(2),...a_(10)` be "10" observations such that `sum_(k=1)^(10)a_(k)=50` and `sum_(AA k lt j)a_(k)*a_(j)=1100`.Then the standard deviation of `a_(1),a_(2),...,a_(10)` is equal to

A

10

B

`sqrt(115)`

C

5

D

`sqrt5`

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