Faculty in the psychology department at APUS consume an average of 5 cups of coffee per day with a standard deviation of 1.5. The distribution is normal. How many cups of coffee would an individual at the 25th percentile drink per day?
statistics - PsyDAG, Thursday, August 16, 2012 at 1:58pm
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.25) related to a Z score. Insert the values into the above equation and solve for the score.