If the standard deviation of the number \( 2,3, a \) and
\( \mathrm...
If the standard deviation of the number \( 2,3, a \) and
\( \mathrm{P} \) 11 is 3.5 , then which of the following is true?
W
(1) \( 3 \dot{a}^{2}-26 a+55=0 \)
(2) \( 3 a^{2}-32 a+84=0 \)
(3) \( 3 a^{2}-34 a+91=0 \)
(4) \( 3 a^{2}-23 a+44=0 \)
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