39. 7 times 5 equals 35 plus 4 equals 39 :)
The third data table accurately represents data in the histogram.
If you draw the histogram, it looks like in the .jpeg image enclosed with this answer.
I think this is how it’s done.
The slope is 3/2. The slope perpendicular to that would be -2/3
999/2=499.5
50% is equivilent to half so if you divide 999 by 2 you get 499.5