The average person cannot pull an eight-part slingshot

Yes.

The average adult’s arm strength can draw a bow weighing up to 100 pounds. The strength of adults is definitely stronger than that of junior high school students. If junior high school students want to increase their strength, they can insist on lifting dumbbells every day. Junior high school students lifting dumbbells every day can not only enhance their strength but also improve their learning efficiency. Junior high school students can improve their learning efficiency only by combining work and rest.