Moments of probability distributions

Probability distributions can be described by their moments. Consider the probability distribution of a random variable x. The mth moment of 

The second moment (X2 is also called the variance and denoted by 

The third moment is related to the skewness of a distribution, aj, a measure of asymmetry, as follows 

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Rate constants in bottleneck model Length of cell rth moment of probability distribution Mass of a cell Population density number of genes in Rahn s model... 

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