change in y values of 1st and last points divided by the change in x values of the 1st and last points
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If you graph distance vs. time, the slope of the line will be the average speed.
The mean is simply the average. Mean = Sum of data divided by the total number of observations.
If an x-t graph is a position-time graph, velocity is the slope of the line on the graph.
You can use a graph to calculate speed.
You calculate the coordinates using a fraction!