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fadila  median should be: 70 for group X ; 85 for group Y median here is the avarage of Diastolic BP measured betweeen the 50 & 51 patients (since the number of patients in each group in even; Median= (n+1)/2 -> (100+1)/2= 50.5) Group X = (70+70)/2 = 70 Group Y = (80+90)/2 = 85 +