- #1
twoski
- 181
- 2
Homework Statement
X is a normal random variable with mean 1, variance 4.
1. Find P( X(X-1) > 2 )
2. Find a value 'a' for which P(|X| > a ) = .25
The Attempt at a Solution
I had no idea how to start 1.
For 2, i got this far then got stuck:
P(|X| > a) = 1 - P((X-1)/2 <= (a-1)/2) = 1 - Ф((a-1)/2)