An elementary school teacher decides to poll the class on the difficulty of last night’s homework assignment.

“How many people were able to complete the assignment without parent’s help?” About 25% of the class raises their hands.

“How many people were able to complete the assignment with the help of a parent?” About 70% of the class raises their hands.

The teacher still notices about 5% of the class did not raise their hands. She then calls out, “How many people had to help a parent complete your assignment?”