Let X be a normal random variable with mean 1 and variance

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Let X be a normal random variable with mean 1 and variance 4. The probability P{X < 0} is

1. 0.5
2. greater then a zero and less than 0.5
3. greater than 0.5 and less than 1.0
4. 1.0

Correct Option: B

P (x <0) = P		(X - X)	<	0 - X
		σ		σ

∵ P (x > a) represents area under curve for x > a