Question $10$

$10pts$

Consider an espresso stand with a single barista. Customers arrive at the stand at the rate of $15$ perhour, according to a Poisson distribution. Service times are exponentially distributed with a service rate of $30$ customers per hour. The average time in minutes a customer spends in the system $($fie$.$ waiting and being served$)$ is minutes

$15$

$(8)$

$r^3+3$

$4$

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