#1 is correct.
#2
#3 Is for you to do.
Let X~N(0,1) . Compute each in terms of function ϕ. (0 being mu and 1 being delta^2)
And evaluate it numerically.
1. P(X<=-5)
2. P(-2<=X<=7)
3. P(X>=3)
for the first one i get
ϕ(-5)
But how do i evaluate it?
this is a wiki page on it
Normal distribution - Wikipedia, the free encyclopedia