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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 ? (1) `3a^2-26 a+55=0` (2) `3a^2-32 a+84=0` (3) `3a^2-34 a+91=0` (4) `3a^2-23 a+44=0`

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
B
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