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Fig8.1.9.1-4: Estimating the mean value for a CDF graphically, using a 2m temperature example.  The mean value of a set of ensemble forecast results may be obtained by adjusting a vertical line V laterally until the area A above the CDF curve equals the area B below the curve. In this example the mean V for the black (M-Climate) profile is slightly above the median (where the y-axis probability = 50%), implying some skew to the distribution (related to the longer positive tail).  The same approach could be used to estimate the mean for any of the coloured (forecast) CDFs shown.



(FUG Associated associated with Cy50r1)