If the mean and the standard deviation of the data 3 ,
P 5,7 , a, b...
If the mean and the standard deviation of the data 3 ,
P 5,7 , a, b are 5 and 2 respectively, then a and \( b \) are the
W roots of the equation
(1) \( x^{2}-20 x+18=0 \)
(2) \( 2 \mathrm{x}^{2}-20 \mathrm{x}+19=0 \)
(3) \( \mathrm{x}^{2}-10 \mathrm{x}+18=0 \)
(4) \( x^{2}-10 x+19=0 \)
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