Chapter 3.10: Linear Approximations and Differentials

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QA: The average length of a waiting line is
f(rho) = rho / (1-rho)
where "rho" is how busy the server is (between 0 and 1).
That is, if rho=0.95, the server is busy 95% of the time.
Linearize around rho=0.95; compare dy and delta y using
d rho = +0.04