Jack is doing an experiment to find the rate at which water flows from a tap into a tub. He records the height of the water every minute and plots the data using a scatter plot. What is the height of the water after 3.5 minutes?

The height will be 17.5 cm
If we look at the graph, the x axis shows the time passed and the y axis shows the height. By following the graph, if we see at the mid point of 3 and 4 it comes out to be 3.5 and the same thing can we do for y axis as well, the point on y axis will be the mid point of 15 and 20 which come out be 17.5 centimeters.