The box-and-whisker plot represents the numbers of gallons of water needed to fill different types of dunk tanks offered by a company. A box-and-whisker plot shows the number of gallons of water. The whiskers range from 350 to 750. The box ranges from 450 to 600 with the vertical bar inside the box at 500. a. What fraction of the dunk tanks requires at least 500 gallons of water? Write the fraction in simplest form. About of the dunk tanks require at least 500 gallons of water.