Compute the Variance EX 19 EY 19SolutionEX2 11624182420212

Compute the Variance.

E(X) = 19

E(Y) =19

Solution

E[X²] = .1*16²+.4*18²+.4*20²+.1*22² = 363.6

so variance = E[X²]-[E(X)]² = 2.6

|||y

E[Y²] = .3*16²+.2*18²+.2*20²+.3*22² = 366.8

so variance =  E[X²]-[E(X)]² =5.8