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(a) It is observed ina communication channel that 90%of the messages sent are received without any...

(a) It is observed ina communication channel that 90%of the messages sent are received without any error. Find the probability that among 18messages sent through the channel,at least 16are received without any error.

b) The number of visitors toa webpage per minute follows a Poisson distribution. If the average number of visitors per minute is 4, what is the probability that the webpage receives at least 2visitors in one minute.

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