# Thread: When using normal approximation.... (fast word answer)

1. ## When using normal approximation.... (fast word answer)

When using normal approximation for binomial distribution (z-scores, standard deviation, mean ect...) can you ever put the mean before the other number
so (MEAN-X)/standard deviation?????????

2. Originally Posted by Arbitur
When using normal approximation for binomial distribution (z-scores, standard deviation, mean ect...) can you ever put the mean before the other number
so (MEAN-X)/standard deviation?????????
Why would you want to?

3. Originally Posted by Arbitur
When using normal approximation for binomial distribution (z-scores, standard deviation, mean ect...) can you ever put the mean before the other number
so (MEAN-X)/standard deviation?????????
This will change the sign of the z-score, so depending on the table you are
using it will possibly allow you to look up a probability for a non-tabulated z-score, or will give the other tail probability, or ..

But there realy is no point (as far as I can see).

RonL