Answer:
<u>25%</u> is the percent error.
Step-by-step explanation:
Given:
The world's largest marathon, The New York City Marathon, is held on the first Sunday in November each year. Between 2 million and 2.5 million spectators will line the streets to cheer on the marathon runners.
Now, to find the percent error.
As given, between 2 million and 2.5 million spectators will line the streets to cheer on the marathon runners.
<em>The actual measure</em> = 2 million.
The estimated measure = 2.5 million.
<em>So, the error</em> = 
Now, to get the percent error:



Therefore, 25% is the percent error.