Question: 1.10 () www Suppose that the two variables x and z are statistically independent. Show that the mean and variance of their sum satisfies E[x

1.10 () www Suppose that the two variables x and z are statistically independent.

Show that the mean and variance of their sum satisfies E[x + z] = E[x] + E[z] (1.128)

var[x + z] = var[x] + var[z]. (1.129)

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