An analyst studies the turnover of a company over ten years. Let x be the number of years after the first year the analyst looks at. Y is the turnover in year x and the analyst assumes that the turnover is a normally distributed stochastic variable with expectation E (Y) = ?0 + ?1x and standard deviation ? = 0.1. Based on the observations, the analyst finds that:

x = 3,6 ogy = 4, 49 M = Cio(x; - 2)2 = 7,44, Eio(xi - x)yi = 4, 85