- Example: P(Z<-1)

Question: What proportion of the z distribution falls below a z score of -1?

  1. In Minitab select Graph > Probability Distribution Plot > One Curve > View Probability, hit OK.
  2. Select Normal (Note: The default is the standard normal distribution)
  3. Select Options
  4. Select A specified x value
  5. Select Left Tail
  6. For X value enter -1
  7. OK

    The proportion of the z distributions that falls below -1 is 0.1587.