The Venn diagram in the image shows a list of students who studied on Saturday, Sunday, or both.

• Studied Saturday only: Erin
• Studied Sunday only: Dawn
• Studied both Saturday and Sunday: Jess, Josh, Brian, Ken, Kelly

So, the students who studied on either Saturday or Sunday are:

• Erin
• Dawn
• Jess
• Josh
• Brian
• Ken
• Kelly

Thus, the answer in roster form is: Erin, Dawn, Jess, Josh, Brian, Ken, Kelly

Would you like more details or clarifications?

Here are five questions for further practice:

1. Who studied only on Saturday?
2. Who studied only on Sunday?
3. Who studied on both Saturday and Sunday?
4. How many students studied on at least one of the two days?
5. If someone didn't study on either day, who would that be?

Tip: Venn diagrams are a great way to visualize sets and their intersections, especially for finding common or exclusive elements.