There follows the formula for "z-score:"
raw score - mean
z = ------------------------------
standard dev
9.1 - 8
Here, the z-score is z = ------------- = 0.344
3.2
I believe AFE is 0°
CFE is 105°
And BFD is 90° I think
\left[x \right] = \left[ \frac{-1}{4}\right][x]=[4−1] = x*3 +3x*2+6) - (9x*2-5x+7
30% = 3/10 = .3
70 x .3 = 21
I cannot see what the selections are in order to help you correctly