The mean and variance of the data \( 4,5,6,6,7,8, x, y \) \( \mathr...

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The mean and variance of the data \( 4,5,6,6,7,8, x, y \)
\( \mathrm{P} \) where \( xy \), are 6 and \( \frac{9}{4} \) respectively. Then \( x^{4}+y^{2} \) is

W equal to
(1) 162
(2) 320
(3) 674
(4) 420
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