Answer:
Choose random people at the door of the gym by choosing someone every 7 people that enter, and ask them for permission first. Collect their name, zip code, age, and the time they usually attend the gym, as well as any other classes they take from the gym. Then, ask “which of the following classes would you be most likely to attend to?”, and list out the possible classes. Repeat for the other 9 people.
Step-by-step explanation:
The fact that you’re choosing someone every 7 people shows that you’re truly being random and not picking and choosing people that you know. Their name helps you keep the data straight. The zip code lets you know how far they are driving. The class they usually attend helps you know what their interests are at the gym. The time they usually attend helps you know when to host the class, and the last thing, which is what class they would be most likely to attend, helps you know what kind of class you should start hosting more often.