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+//ANALOG AND DIGITAL COMMUNICATION
+//BY Dr.SANJAY SHARMA
+//CHAPTER 11
+//Information Theory
+clear all;
+clc;
+printf("EXAMPLE 11.55(PAGENO 538)");
+
+//given
+P_x1 = 1/2//probability of first signal
+P_x2 = 1/4//probability of second signal
+P_x3 = 1/8//probability of third signal
+P_x4 = 1/16//probability of fourth signal
+P_x5 = 1/16//probability of fifth signal
+n1 = 1//number of bits in code obtained from table given textbook
+n2 = 2//number of bits in code obtained from table given textbook
+n3 = 3//number of bits in code obtained from table given textbook
+n4 = 4//number of bits in code obtained from table given textbook
+n5 = 4//number of bits in code obtained from table given textbook
+
+//calculations
+L = P_x1*n1 + P_x2*n2 + P_x3*n3 + P_x4*n4 + P_x5*n5;//Average number of bits per message
+
+//results
+printf("\n\nAverage number of bits per message = %.2f bits",L);