use the scatter plot to answer the question how many people are presented on the scatter plot

Unfortunately, as an AI text-based model, I am unable to see images or specific scatter plots. Therefore, I am unable to answer your question without further information or description of the scatter plot. However, typically, a scatter plot will have data points representing pairs of values (x, y). The number of people presented on the scatter plot would depend on the context and what the x and y axes represent.