From the provided scatterplot titled "Visitors to the Food Truck," one reasonable statistical investigative question is:
What percentage of customers is over 21?
To answer this, you would count the number of data points (customers) representing ages greater than 21 and compare that with the total number of customers represented in the scatterplot. Based on the distribution of ages provided in the points, if you calculate this correctly, you might find that indeed around 60 percent of the customers are over 21.
So, the correct response is:
What percentage of customers is over 21? The answer is 60 percent.