At a Certain Factory, the Output Q Is Related to Inputs

Short Answer

At a certain factory, the output Q is related to inputs x and y by the expression $Q ( x , y ) = 4 x ^ { 4 } + 8 x ^ { 2 } y ^ { 4 } + 7 y ^ { 4 }$ If 0 $\le$ x $\le$ 7 and 0 $\le$ y $\le$ 8, what is the average output of the factory? (Approximate to 2 decimal places.)