(i) To find the number of journey times between 25 and 45 minutes, subtract the cumulative frequency at 25 minutes from the cumulative frequency at 45 minutes: \(50 - 18 = 32\).

(ii) To draw the histogram, calculate the frequency for each interval: \([0, 10]: 0\), \((10, 25]: 18\), \((25, 45]: 32\), \((45, 60]: 9\), \((60, 80]: 4\). Then, calculate the frequency density by dividing the frequency by the class width: \(\frac{18}{15} = 1.2\), \(\frac{32}{20} = 1.6\), \(\frac{9}{15} = 0.6\), \(\frac{4}{20} = 0.2\). Draw bars with these heights.

(iii) To estimate the mean journey time, use the midpoints of each interval: \((17.5 \times 18) + (35 \times 32) + (52.5 \times 9) + (70 \times 4)\). Sum these products and divide by the total frequency: \(\frac{2187.5}{63} = 34.7\) minutes.