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Question 1

(a) For X1, mu=-2, sigma=1.
(b) For X2, mu=-2, sigma=2.
(c) For X3, mu=3, sigma=1.
(d) For X3, mu=3, sigma=2.
(e) P(Z<-2) = .025.
(f) .025.

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Question 2

(a) .32 (just read it off the table).
(b) .08+.32=.4
(c) .32/(.32+.48) = .4
(d)  yes
(e) yes, it must be 0 or 1.
(f) E(X)=p = P(X=1) = .6 
(g) Y ~ Bernoulli(.8), X~Bernoulli(.6) => Var(X) > Var(Y).