A Discrete memoryless source Y generate 8-symbols with the following probabilities: {0.1, 0.15, 0.2, 0.2, 0.25, 0.05, 0.025, 0.025} a) Find a binary Huffman code (with minimum variance) for Y and determine the average codeword length. b) Determine a binary Shannon-Fano code for Y and calculate the average codeword length.