Mrs. Rowan allotted 30 minutes at the beginning of class for her students to complete an exam. The last student took 42 minutes to complete. What is Mrs. Rowan's percent error?

Step-by-step explanation:

For this exercise you need to use the following formula that is used to calculate the Percent error:

Where "E" is the experimental value and "T" is the theoretical value.

In this case, knowing the information given in the exercise, you can identify that the values of "E" and "T" are the shown below:

Therefore, knowing these values, you can substitute them into the formula and then you must evaluate, in order to find Mrs. Rowan's Percent error.

You get that this is: