Mean
Variance, where sqrt(sigma2) is the standard deviation aka Normal distribution
StatisticsSemigroup
StatisticsSemigroup
StatisticsSemigroup
collect statistics about the calls to the wrapped Semigroup
This monoid stems from the fact that if X and Y are independent random variables that are normally distributed, then their sum is also normally distributed, with its new mean equal to the sum of two means and variance equal to the sum of two variances.
This monoid stems from the fact that if X and Y are independent random variables that are normally distributed, then their sum is also normally distributed, with its new mean equal to the sum of two means and variance equal to the sum of two variances. http://en.wikipedia.org/wiki/Sum_of_normally_distributed_random_variables