<human>:  How do you calculate the variance of a Monte Carlo simulation?
<bot>: The variance of a Monte Carlo simulation is the standard deviation of the sample space. A Monte Carlo simulation is a statistical method for estimating the value of a random variable. It is a very general method for estimating probabilities, and it can be applied to any random variable. A Monte Carlo simulation is used in a wide range of fields, including finance, economics, and physics.