To draw the histogram, calculate the frequency density for each class interval using the formula:

\(\text{Frequency Density} = \frac{\text{Frequency}}{\text{Class Width}}\)

Class widths are: 20, 10, 5, 10, 15.

Calculate frequency densities:

\(\frac{18}{20} = 0.9\)

\(\frac{48}{10} = 4.8\)

\(\frac{34}{5} = 6.8\)

\(\frac{32}{10} = 3.2\)

\(\frac{18}{15} = 1.2\)

Draw bars with these heights on the histogram, ensuring the axes are labeled with 'Frequency Density' and 'Time in minutes'.