Answer:
To determine the minimum amount you have to spend to be in the top 5% of spenders and receive a free T-shirt, you need to know the total number of visitors or spenders at the theme park and the spending distribution.
Let's assume there are N visitors or spenders, and you want to be in the top 5%, which means you want to have a spending higher than 95% of the visitors.
1. Calculate 95% of N. This represents the spending threshold for the top 5%.
2. Find the amount spent by the person at the 95% position.
So, if you have the total number of visitors or spenders and their spending data, you can calculate the minimum spending required to be in the top 5%.