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+//Exa 3.9
+// To calculate probability of exceeding signal beyond the receiver sensitivity.
+
+clc;
+clear all;
+
+SSmean=-100; //signal strength(dBm)
+Sr=-110; //receiver sensitivity(dBm)
+sd=10;  //standard deviation(dB)
+
+//solution
+P_Smin=(0.5-0.5*erf((Sr-SSmean)/(sqrt(2)*sd)));
+printf('probability of exceeding signal beyond the receiver sensitivity is %.2f \n',P_Smin);