The Life Table   17

In this curve, yo=do=OA, or the area of the rectangle OB, since AB=1.

x =ON

dY=PN, or the rectangle NC since PC=1.

lx =the sum of all the ordinates at unit intervals beginning with P N and going to the end of the curve, or the area made up of the sum of all the rectangles to the right of PN since the width of each of these rectangles is unity.