I think it's 12x.
I'm not a 100% sure though, but I hope this helps. =^D
The correct answer is maybe 3
a) Negative correlation
Negative correlation corresponds to points that move down as you go from left to right on the scatter plot.
b) Positive correlation
Positive correlation corresponds to points that move up as you go from left to right on the scatter plot.
c) No correlation
Scattered points on the scatter plot make no relationship.
7/8 boats per day will make it