How do I solve 11b)?

Why did a tutor say the points are (2, 150) and (4, 175) on the graph, but it doesn't match up with the picture?

11.A new species of bird is introduced into a sanctuary. Conservationists monitor the population of the birds for many years. The results are shown in the following graph. Bird Sanctuary Population 200 1?5 150 125 100 Population 3'5 50 25 Years a) Find the average Rate of Change from both: i) year 0 4 ii) years 8 18 MI Ml Question 11 continued here: b) Estimate the instantaneous Rate of Change at year 2