_                                       _
                    |            N                            |
                    |           ---                           |
                    |     1     \                          2  |
    Std_Dev = SQRT  |  -------   >   (Delay[n] - MeanDelay)   |
                    |    (N)    /                             |
                    |           ---                           |
                    |          n = 1                          |
                    |_                                       _|