What is the purpose of the talk?

Good morning. I’d like to thank you all for taking part in this focus group. We have a new line of breakfast cereal that we want to test before it goes into production. We’ve prepared four varieties for you to try, and we’d like you to fill out a brief survey after trying each flavor. To show our appreciation, we have some product samples that you can take home and share with your families when you finish. Help yourself. You can take as many as you like.
74.What is the purpose of the talk?
75.What are the listeners asked to do?
76.What does the speaker imply when he says, “Help yourself"?