Customers arrive at a single-server queueing system according to a Poisson process at a mean rate of

Question:

Customers arrive at a single-server queueing system according to a Poisson process at a mean rate of 10 per hour. If the server works continuously, the number of customers that can be served in an hour has a Poisson with a mean of 15. Determine the proportion of time during which no one is waiting to be served.
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...