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+//Caption: Quartile Deviation
+//Example3.14
+//Page53
+clear;
+clc;
+X = [0,10;10,20;20,30;30,40;40,50;50,60;60,70;70,80;80,90;90,100];
+f = [5,8,10,15,20,10,7,4,3,6];
+cum_f = 0;
+for i = 1:length(f)
+    cum_f = cum_f+f(i);
+    sigmaf(i) = cum_f;
+end
+N = cum_f; //total number of salesman
+cen1 = N/4;
+cen2 = 3*N/4;
+for  i = 1:length(f)
+    if ((sigmaf(i)< cen1) &(cen1< sigmaf(i+1))) then
+        L1 = X(i+1,1);
+        f1 = f(i+1);
+        F1 = sigmaf(i)
+        C = diff(X(i+1,:));
+    end
+    if ((sigmaf(i)< cen2) &(cen2< sigmaf(i+1))) then
+        L3 = X(i+1,1);
+        f3 = f(i+1);
+        F3 = sigmaf(i)
+        C = diff(X(i+1,:));
+    end
+end
+disp(L1,'Lower limit of the first quartile class L1 =')
+disp(f1,'Frequency of the first quartile class f1 =')
+disp(F1,'Cumulative frequency of the previous class w.r.to the first quartile class F=')
+disp(C,'Width of the class interval C=')
+Q1 = L1+(((N/4)-F1)*C/f1);
+disp(Q1,'Fist Quartile Q1=')
+disp(L3,'Lower limit of the third quartile class L1 =')
+disp(f3,'Frequency of the third quartile class f1 =')
+disp(F3,'Cumulative frequency of the previous class w.r.to the third quartile class F=')
+disp(C,'Width of the class interval C=')
+Q3 = L3+(((3*N/4)-F3)*C/f3);
+disp(Q3,'Third Quartile Q3=')
+QD = (Q3-Q1)/2; //Quartile Deviation
+disp('in Lakhs',QD,'Quarile Deviation QD =')
+Coeff_QD = (Q3-Q1)/(Q3+Q1);
+disp(Coeff_QD,'Coefficient of Quartile Deviation =')
+//Result
+// 
+// Lower limit of the first quartile class L1 =   
+// 
+//    20.  
+// 
+// Frequency of the first quartile class f1 =   
+// 
+//    10.  
+// 
+// Cumulative frequency of the previous class w.r.to the first quartile class F=   
+// 
+//    13.  
+// 
+// Width of the class interval C=   
+// 
+//    10.  
+// 
+// Fist Quartile Q1=   
+// 
+//    29.  
+// 
+// Lower limit of the third quartile class L1 =   
+// 
+//    50.  
+// 
+// Frequency of the third quartile class f1 =   
+// 
+//    10.  
+// 
+// Cumulative frequency of the previous class w.r.to the third quartile class F=   
+// 
+//    58.  
+// 
+// Width of the class interval C=   
+// 
+//    10.  
+// 
+// Third Quartile Q3=   
+// 
+//    58.  
+// 
+// Quarile Deviation QD =   
+// 
+//    14.5  
+// 
+// in Lakhs   
+// 
+// Coefficient of Quartile Deviation =   
+// 
+//    0.3333333  
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