Measuring Demand Uncertainty Assume that demand for each period i,i=1,...,L is normally distributed with a mean D;and standard deviation oi Let pii be the correlation coefficient of demand between periods i and j. The total demand during L periods is normally distributed with a mean of D,.and a standard deviation of oL, Du=2n.L=V含+2grw SEIEE AU406 11+ - SEIEE AU406 11 Measuring Demand Uncertainty  Assume that demand for each period 𝑖, 𝑖 = 1, … , 𝐿 is normally distributed with a mean 𝐷𝑖and standard deviation 𝜎𝑖  Let 𝜌𝑖𝑗 be the correlation coefficient of demand between periods 𝑖 and 𝑗.  The total demand during 𝐿 periods is normally distributed with a mean of 𝐷𝐿 and a standard deviation of 𝜎𝐿