b) Three stations share a 60 kbit/s ALOHA channel. The average bit rates transmitted from each of the three stations are 5 kbit/s, 8 kbit/s and 11 kbit/s. The length of each packet is 75 bits. i) Determine the normalized throughput of pure and slotted ALOHA. ii) Draw the general relationship between throughput and traffic for both pure and slotted ALOHA.

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8) Data packets containing 100 bits are transmitted over a communication link A transmitted bit is received in error with probability p, independent of other bits. a) What is the probability that k bits received are in error? b) Probability that 3 or less bits are received in error.