Percentiles
NOTE: "StdDev" simply specifies a starting value for the "FindRoot" search. As with all numerical solvers, FindRoot is somewhat sensitive to the choice of this initial values; if the answer provided does not make sense, try another starting point as a check.
Since the Normal is a symmetric distribution, using the expected value as the starting point can result in some confusion. Hence in this case we choose to start at one standard deviation.
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Created by Mathematica (July 20, 2006) |