Please help Let z of a normal distribution be (0,1). Recall the definition of z-value i.e. P(Zzr)=r Find the probability of P(-z alpha/2

Question

Please help
Let z of a normal distribution be (0,1). Recall the definition of z-value i.e. P(Z>zr)=r
Find the probability of P(-z alpha/2<Z< z alpha/2)

mathmale · Answer

I'm not sure I understand this problem completely, but do have some ideas.

In general, "alpha" represents the SUM of the areas (representing probabilities) in the two tails of the standard normal probability distribution.  

If I'm right on that (and only IF), then the probability that Z is between plus or minus alpha/2 is simply 1-alpha.  

Draw this situation, please, and look for examples in y our textbook or online before you decide whether or not my suggestion is indeed the correct answer.  In the end it's still your decision.