Data collected from a coffee shop indicate that the price of a drink forms a consistent pattern that can be graphed as the given uniform density curve. A graph titled cost of drinks has cost (dollars) on the x-axis. A horizontal line is at y = one-third from 3 to 6.

What proportion of drinks cost between $3.50 and $4.00??
1 Over 30
One-sixth
One-third
One-half