I'm just guessing but try -7
The person above me is right
Compare
to
. Then in applying the LCT, we have

Because this limit is finite, both

and

behave the same way. The second series diverges, so

is divergent.
The interquartile range is 7
so a
28 + vector b = -12
vector b = -40
vector b has magnitude 40 units in the negative y direction.