The relative frequency table below shows the waiting time, to the nearest minutes, of patients at the out-patient unit of a hospital. 13. Waiting time (min) 1 - 10 11 - 20 21 - 30 31 - 40 41 - 50 Relative frequency 0.06 0.20 0.28 0.32 0.14 Estimate the mean waiting time of the patients. Find the percentage of patients who have to wait longer than the mean waiting time.

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