Sorry

This answer is incorrect.

If you look at the figure below, you will see that it is the exact same figure as in the question except that some of the grid lines were removed for clarity. You will also notice a number above each set of bars. This number represents the difference between the predicted amount of gasoline sales and the actual gasoline sales.

Image depicting Graph Chart with numbers ten through ninety on left side and the months along the bottom. Chart shows both predicted and actual sales for each month. January's difference is two. February's difference is two. Marches difference is two. April's differenc is two. May's difference is one. June's difference is two. July's difference is two. August's difference is one. September's difference is seven. October's difference is one. November's difference is four. December's difference is one.

As you can see September has a difference of 7 which is the greatest of any of the months.

Now let us try another one

The students in Ohio began breaking out in a strange disease marked by green spots all over their bodies. This graph shows the number of new cases that were diagnosed each week. Which group of students seemed to develop an immunity to the disease?

Clickon image for detailed description of chart

 

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