With a mean of 1mu1 minutes for major language request and, Ask an Expert

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The information center gives services in bilingual languages; requests for service arrive by telephone. Main language service requests and minor language service requests arrive according to independent Poisson processes with respective rate λ1 and λ2 requests per hour. The service time for each request is exponentially distributed with a mean of 1/μ1 minutes for major language request and a mean of 1/μ2 minutes for minor language request.

1. what is the probability that in the next hour a total of n service requests will arrive?
2. what is the probability density of service time of an arbitrarily chosen service request?

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