Quantitative Aptitude

An ogive of pump flow rates (L/s) shows that the 10th percentile ($P_{10}$) is 15 L/s and the 90th percentile ($P_{90}$) is 45 L/s. If the distribution is roughly normal, the estimated inter-decile range ($P_{90} - P_{10}$) is:

Options:

• (A) 30 L/s
• (B) 25 L/s
• (C) 35 L/s
• (D) 20 L/s