posted by Jessica on .
In a normal distribution with the mean being 500 and the standard deviation being 100, what raw score separates the top 40% of a distribution from the rest?
Find the z-score using a z-table that represents the top 40%. Then use z-score formula to find x.
z = (x - mean)/sd
mean = 500
sd = 100
I hope this will help get you started.