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.
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?
2 answers
125
1 answer