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Homework Help: Probability values and z scores

  1. May 12, 2010 #1
    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
  2. jcsd
  3. May 12, 2010 #2
    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.
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