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If the standard deviation of the numbers...

If the standard deviation of the numbers 2, 3, a and 11 is 3.5. Then which of the following is true ?

A

`3a^(2)-26a+55=0`

B

`3a^(2)-32a+84=0`

C

`3a^(2)-34a+91=0`

D

`3a^(2)-23a+44=0`

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