response time -> expected response time

paper.tex

@@ -255,7 +255,7 @@ Fig. \ref{fig:Behavior} shows the results of the behavioral measurement.
 
 We can consider the water dispenser and students as comprising a queueing
 system, specifically an M/G/1 queue \cite{stewart_probability_2009}.
-The response time, i.e., the time spent waiting as well as
+The expected response time, i.e., the time spent waiting as well as
 the time dispensing water, is \cite[Section 14.3]{stewart_probability_2009}%
 \begin{align*}
     W = E\mleft\{ S \mright\} + \frac{\lambda E\mleft\{ S^2 \mright\}}{2\mleft( 1-\rho \mright)}