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Return a number in the interval [lower_bound, upper_bound) selected at random with a uniform distribution.
Return a number selected at random from a Gaussian distribution with mean mean and standard deviation stddev.
Return an integer selected at random from a Poisson distribution with mean mean and standard deviation sqrt(mean).
If lower_bound=upper_bound, return a value selected at random from a Pareto distribution with shape shape and scale lower_bound. If lower_bound<>upper_bound, return a value selected at random from a bounded Pareto distribution with shape shape and bounded by the range [lower_bound, upper_bound].