Line Plots · Medium problem

A line plot shows the lengths of pieces of string, in feet. Above $\dfrac{1}{4}$ there are $2$ X's, above $\dfrac{1}{2}$ there are $3$ X's, and above $\dfrac{3}{4}$ there are $2$ X's. If all the pieces are laid end to end, how many feet long is the line of string? Write your answer as a fraction.