If the number of customers in a queue is 8, the arrival rate is 2 customers per minute, and the customer service rate is 4 customers per minute, what is the average number of customers in the system?
A) 10 customers
B) 12 customers
C) 8.5 customers
D) 10.5 customers
Question 2
Stratified random sampling ________.
A) eliminates homogeneous sampling error
B) is used with populations that are naturally divided into subsets
C) has the drawback of introducing sampling bias
D) allocates sampling error disproportionately
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