Refer to the final subsection "Logistic Model in Another Context" and Fig. 2.5.9 to explore the application of the logistic equation to the oil industry, as follows.
(a) The phrase "Hubbert peak" refers to a graph not shown, the graph of y' versus t. Sketch this missing graph from the information in the ty picture in Fig. 2.5.9. Your result should be bell-shaped but not exactly in the same way as the Gaussian bell curve of Sec. 1.3. Example 5 Describe the differences.
(b) Show how much the pictures and arguments might differ if the inflection point occurs lower in the ty graph of Fig. 2.5.12. Explain why. Sketch a typical ty graph. Then sketch a typical ry' graph from your ty graph, as in part (a).

(c) Use your results from parts (a) and (b) to discuss to what extent the logistic equation can represent oil recovery phenomena in general.

inflection point