سوال ۲۳ کنکور ارشد علوم کامپیوتر ۱۳۹۷

PASSAGE 2 (excerpt): "Most subdivision algorithms are based on a formulation by Fournier, Fussell and Carpenter (1982) that recursively subdivides a single line segment. ... It uses self-similarity and conditional expectation properties of fractional Brownian motion to give an estimate of the increment of the stochastic process. The process is also Gaussian and the only parameters needed to describe a Gaussian distribution are the mean (conditional expectation) and the variance."

The mean for the description of the Gaussian distribution is ______.