Question: The standard normal random variable has first four moments: E(Z) = 0, E(Z2) = 1, E(Z3) = 0, and E(Z4) = 3. The random variables

The standard normal random variable has first four moments: E(Z) = 0, E(Z2) = 1, E(Z3) = 0, and E(Z4) = 3. The random variables Z1, Z2, Z3 are independent standard normal random variables. What is E[(Z?+Z3 + Z3)2]? This problem is worth 50 points

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