The number of visitors to a hospital in a week was recorded. The results are shown in the table. Number of visitors Frequency 500-1000 10 1000-1500 25 1500-2000 15 2000-2500 5 2500-3000 5 Giving your answers to the nearest whole number find: a the lower quartile Qu b the upper quartile Qu e the interquartile range.

AppendixLO1