Problem 15-5 the reference desk of a university library receives requests for assistance. assume that a poisson probability distribution with an arrival rate of 10 requests per hour can be used to describe the arrival pattern and that service times follow an exponential probability distribution with a service rate of 12 requests per hour. what is the probability that no requests for assistance are in the system? if required, round your answer to four decimal places.

The probability that no requests for assistance are in the system is 0.1667.

Step-by-step explanation:

Since we have given that

Arrival rate =

Service rate =

the probability that no requests for assistance are in the system is given by

Hence, the probability that no requests for assistance are in the system is 0.1667.

c

step-by-step explanation:

d

step-by-step explanation:

by observation, we can see that the the graph is simply the graph of y = |x| that has been shifted 4 units downwards and 3 units to the left.

we can recognize in choice d :

y = | x + 3 |   - 4 (rewriting in general form)

y = | x - (- 3) |   - 4

the "-4 " term means   that the graph has been shifted by 4 units in the negative y direction

the "-3 " term means   that the graph has been shifted by 3 units in the negative x direction

this matches our observation of the graph described above.