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8-21.

The choir is planning a trip to the water park, and the parents are trying to determine how much to charge each child. The cost to use a school bus is $350. Complete the table at right, graph your results, and then answer parts (a) and (b) below.  

  1. Think back to your work with proportions. Is this a proportional relationship?

    To complete the table, divide by the number of students.

    Graphs of proportional relationships can pass through the point . Does your graph look like it will pass through ?

  1. Is there an association between the number of students and the cost per student? If so, describe it. Consider the form, direction, and outliers in your description.

    • For every student added, the trip costs less for everyone.

      There is a non-linear negative association.

Number of  
Students on  
the Trip

 Bus Cost per
Student ($)

Use the eTool below to help complete the table and graph the problem.
Click the link at right for the full version of the eTool: 8-21 HW eTool