Ik this doesn't help but maybe look the questions up online bc those are even confusing for me to understand. Really sorry I couldnt help :(
First, compute the mean:

Next compute the absolute deviations for each datapoint:
|75-95.555|=20.555
|89-95.555|=6.555
|145-95.555|=49.445
|85-95.555|=10.555
|80-95.555|=15.555
|92-95.555|=3.555
|104-95.555|=8.445
|90-95.555|=5.555
|100-95.555|=4.445
Next we'll take the mean of these deviations:

The mean absolute deviation of your data is 13.8517
Condense the logarithm on the right side:




So,

and
, which makes (4) the correct choice.
Looking at the given diagram, angle AEC and angle DEB share the same vertex, E. They are described as vertically opposit angles. In geometry, vertically opposite angles are equal. This means that
Angle DEB = angl AEC = 50 degrees