Answer:
3 customers
Step-by-step explanation:
Rate of arrival (λ) = 15 per hour
Service rate (μ) = 20 per hour
The number of customers in a system given the arrival rate and the mean service rate is given by:

Applying the given data:

The average number of customers in the system is 3 customers.
Divide, the first operation is the parentheses and then division
Need more information on it to solve
3 giant Sandwiches,
8 friends,
Have to be shared equally,
Each friend gets =

If we solve, we'll end with 0.375 Which is between 0 and 1.
So,
It will lie in between 0 and 1.
!! Hope It Helps !!