The mean and variance of the data $4,5,6,6,7,8 , x , y$ where $x < y$ are 6 and $\frac { 9 } { 4 }$ respectively. Then $x ^ { 4 } + y ^ { 2 }$ is equal to (1) 320 (2) 420 (3) 162 (4) 674
The mean and variance of the data $4,5,6,6,7,8 , x , y$ where $x < y$ are 6 and $\frac { 9 } { 4 }$ respectively. Then $x ^ { 4 } + y ^ { 2 }$ is equal to\\
(1) 320\\
(2) 420\\
(3) 162\\
(4) 674