1）Z(t) 平稳2）E(Z) = E[X(t)Y(t)] = E[X(t)]×E[Y(t)] = 03) D[Z] = E[Z-E(Z)]² = E(Z²) = E(X²Y²) = E(X²)×E(Y²) = 1×1 = 14) 总功率为 1.
