Gina measured the amount of water her friends drink each day in gallons. The line plot shows the measurements. Which is the difference between the greatest amount of water and the least amount of water shown on the line plot?

Amount of Water
Students Drink per Day
Line plot titled Amount of Water Students Drink by Day with numbers, which represent Quarts, ranging from 1 to 2 in increments of 1/8. 2 x's are at 1 2/8 mark; 3 x's are at 1 4/8 mark; 1 x at 1 5/8 mark; 2 x's at 1 6/8 mark; 1 x at 1 7/8 mark; 1 x at 2 mark.

48 quart

68 quart

1 quart

328 quarts