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+// Exa 2.6  
+//To find traffic intensity in Erlangs and CCS during eight hour period and busy hour(4:00 PM to 5:00 PM).
+//Refer-Table 2.2(page no 28): Traffic on customer line between 9:00PM and 5:00PM
+
+clc;
+clear all;
+
+time=8;  //in hours
+calls=11;  //no of calls in 90mins period
+
+//solution
+CR=calls/time;    //call arrival rate in calls/hour
+tavg=(3+10+7+10+5+5+1+5+15+34+5)/11;    //average call holding time in mins per call
+I= CR*(tavg/60);     //traffic intensity in Erlangs
+printf('Traffic Intensity during eight hour period is %.3f Erlangs = %.1f CCS \n',I,I*36);
+
+//For Busy Hour i.e between 4:00PM and 5:00PM
+CRB=2;       //call arrival rate during busy hour in calls/hour(from table 2.2)
+tavgB=(34+5)/2;  //average holding time during Busy Hour in mins/call (from table 2.2)
+IB=CRB*(tavgB/60); //Traffic Intensity during Busy Hour
+printf(' Traffic Intensity during busy hour is %.2f Erlangs = %.1f CCS',IB,IB*36);