Asked by Anonymous

A normal distribution has a mean of 120 and a standard deviation of 20. What score separates the top 40% of the scores from the rest?
Answered by PsyDAG
Z = (score-mean)/SD

Look in the back of your statistics textbook for a table called something like “area under normal distribution” to find the proportion/probability (.40) and its Z score. Insert data into above equation and solve for score.
Answered by Hatdog
125
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