true or false probability question

P

peanut111

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Jul 17, 2010
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If z is a standard normal random variable and A is a positive number then
P(z<-A)=P(z>A).

Is this true or false and why?
 
peanut111 said:
If z is a standard normal random variable and A is a positive number then
P(z<-A)=P(z>A).

Is this true or false and why?
Click to expand...

Please share your work/thoughts with us, indicating exactly where you are stuck - so that we may know where to begin to help you.
 
i'm having trouble understanding if it'd be true or false. If it's posible (true) I'd love an example to compare it to.
 
Let us start from the begining then:

what does P(z < -A) and P(z > A) mean to you? - in plain layman's words... what do you understand that those expressions are telling you?
 
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