Marcus signed his dog up for an obstacle race. He predicted it would take his dog 18 minutes to complete the obstacle course, but his dog finished in 15 minutes. What is the percent error?
*
1 point
20%
15%
16%
83%
To find the percent error, we need to calculate the difference between the predicted time and the actual time, and then divide that difference by the predicted time and multiply by 100.
The difference between the predicted time and the actual time is 18 - 15 = 3 minutes.
So, the percent error is (3/18) * 100 = 16.67%.
Rounded to the nearest whole number, the percent error is 17%.
Therefore, the correct answer is 16%.