Following figure shows change in resolution from $88$ to $44$ pixels. Assuming the null values are not ignored, what is the value in cell $D$ as shown below. $($Answer to $2$ decimal places$)$

$\backslash$table$[[2,2,3,1],[4,$null,$2,2],[1,3,$null,$1],[2,4,2,3]]$

to

$\backslash$table$[[$A$,B$