ok i get the graph now. its supposed to be read from right to left. the x-axis for sarah not only denotes the number of items but also how they're ranked.
the first item is the hores do vore and she ranked them from 5 to 1 (1 being the best, y axis not used at all) and the machine then gave its rating using the y-axis. the ratings match since the machine gave a score that corresponds to the way sara ordered it.
the last item listed, the meat dish, sara still ranked them from 5 to 1, but compared to the first graph, the machine rated the stuff very different from the way sara rated it.
its just weird that the author decided to use different ways of showing sara and the machines way of ranking the food, one utilizing the y axis and the other one without. on the same graph. about the same things.