Ari had a college graduation party. She invited and predicted that 100 people would attend. 80 out of the 100 invited attended. Calculate the percent error in her prediction.
Round to the nearest hundredth
First, we need to find the difference between the predicted number of people and the actual number of people who attended.
The predicted number of people is 100, and the actual number of people who attended is 80.
So the difference is 100 - 80 = 20.
Then we need to find the percent error, which is the difference divided by the predicted number and multiplied by 100.
Percent error = (difference / predicted number) * 100
Percent error = (20 / 100) * 100
Percent error = 0.20 * 100
Percent error = 20
Therefore, the percent error in Ari's prediction is 20%.