Profit of a production. The profit earned by a manufacturer after selling x products is shown in the following table. Production, x (in 00) Profit, y (in $000) 10 150 20 200 30 250 40 300 50 290 60 240 70 210

a. Plot the data on a scatterplot.

b. If you were given only the information for x = 10, 20, 30, 40, what kind of model would you suggest? For x = 40, 50, 60, 70? For all the data?