If the standard deviation of the numbers 2, 3, a and 11 is 3.5, then which of the following is true ?
$3 a^{2}-23 a+44=0$
$3 a^{2}-26 a+55=0$
$3 a^{2}-32 a+84=0$
$3 a^{2}-34 a+91=0$
Correct Option: , 3
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