A public health analyst is investigating the correlation between the frequency of hospital admissions for patients diagnosed with Dengue fever over the last three years in Klarendon. Using hospital records, the analyst collected data from a sample of 25 patients diagnosed with Dengue fever and noted the number of times each patient was admitted to the hospital during the past 36 months. The recorded data is as follows: 6, 18, 25, 9, 13, 41, 15, 7, 21, 8, 11, 14, 28, 6, 56, 17, 2, 9, 12, 10, 16, 5, 20, 13, 7 Calculate the inter-quartile range