Question

Please help! Put answers for the green boxes. Thanks! -ASIAX

Answer 1

In order to get the results shown, the calculations must be done incorrectly. Ordinarily, instructions to round to a particular precision should be applied only to the final result(s). Here, you are expected to round every intermediate result. (This is generally considered to be WRONG!)
$\sum{X}=1735\\n=4\\\overline{X}=mean=\frac{1735}{4}=433.8$

The numbers in the column $(X-\overline{X})^{2}$ are simply the squares of the numbers in the column to its left. Round the squares to tenths. Their sum should be the value indicated in the bottom row.

The standard deviation is the square root of the variance,
  √(99667.2) ≈ 315.7