Jessica picks tomatoes in her garden. She fills several bags. This line plot shows the weight of each bag. How many more pounds does one of the heaviest bags weigh than one of the lightest bags?

Enter your answer as a fraction in simplest form by filling in the boxes.
Line plot titled Bags of Tomatoes.

The number line is labeled Weight in pounds and goes from 3 and 1 fourth to 4 and 1 half by fourths. There are 3 marks above 3 and 1 fourth, 2 marks above 3 and 1 half, 1 mark above 3 and 3 fourths, 2 marks above 4, 2 marks above 4 and 1 fourth, and 4 marks above 4 and 1 half.