As with Many Other Construction Materials, the Price of Gravel

question 3

Multiple Choice

As with many other construction materials, the price of gravel (per ton) depends on the quantity of material ordered. The following table presents the unit cost (dollars/ton) for gravel for various order sizes (in tons) .
$\begin{array} { c c } \hline \text { Tons of Gravel } & \text { Unit Cost(dollars/ton) } \\\hline 10 & 29.60 \\20 & 22.06 \\30 & 19.88 \\40 & 19.05 \\50 & 17.84 \\60 & 16.93 \\70 & 17.86 \\80 & 17.36 \\90 & 16.74 \\\hline\end{array}$
Which of the following graphs is the correct residual plot for the data set? (Hint: create your own residual plot
And compare it to those shown below.)

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Definitions:

Selling Expenses

Selling Expenses are costs incurred directly from the marketing and selling of products or services, including advertising and salesperson salaries.