Answer
{ Ashley, Emily, Hanna, Ethan, Mike, Josh }
Work Step by Step
The set of students who studied Saturday or Sunday.
The region I, II and III belong to the set of students who studied on Saturday or Sunday.
The names are Ashley ,Emily, Hanna, Ethan, Mike, Josh.
The set of students who studied Saturday or Sunday = { Ashley, Emily, Hanna, Ethan, Mike, Josh }.