Homework Help: Probability values and z scores

1. May 12, 2010

nellas

Can someone explain how to do this. I am totally stuck.
How do you find the z score of you are given the probability? I understand and can calculate the p value from the z score but cannot seem to do it in the opposite direction
Thanks

2. May 12, 2010

hgfalling

Look up the probability in the "probability" column of the table and take the corresponding z-score. If you are using a software package, look for something like NORMINV, the inverse normal distribution function.