Not sure.....but if you draw a line through the sctterpoints of data , the line slope is 0.8
rise/run = 8/10 = .8
It is positive, since the slope is positive
The only choices are 0.8 or 1
Since 1 is a straight line it has to be 0.8
1 would just be the slope of the line of a 45 degree angle......
.8 is the slope of the line a little less than 45 degrees in this example