Probability and expectation involving four standard normal RVs [on hold]

Probability and expectation involving four standard normal RVs [on hold]

pSuppose that $Z_1, Z_2, Z_3$ and $Z_4$ are independent standard normal
random variables./p pFind:/p p(a) $P(Z_1 + Z_2 gt; Z_3+Z_4+1)$ (use the
table of standard normal probabilities)br (b) $E(4Z_1 + 3Z_2 - 2Z_3^2 +
8)$ (no integration needed)/p pI have no idea..../p