deletions | additions       diff --git a/subsection_The_distribution_of_Service__.tex b/subsection_The_distribution_of_Service__.tex  index ece8f56..d0cbbc9 100644  --- a/subsection_The_distribution_of_Service__.tex  +++ b/subsection_The_distribution_of_Service__.tex 
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\subsection{The distribution of Service Time}  The service time is a continuous stochastic variable distributed according to an exponential distribution with parameter $\mu$. The probability density function (\textit{pdf}) of service time is:  \begin{equation}\label{Exponential} \begin{equation}  f(t) = \mu e^{- \mu t}  \end{equation}  The average service time is $W_s = 1 / \mu$. The chart below shows the pdf of the exponential distribution with average service time $W_s=2$ minutes, $W_s=1$ minute, $W_s=2/3$ minute. 
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