statistics
posted by Jessica .
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 zscore using a ztable that represents the top 40%. Then use zscore formula to find x.
z = (x  mean)/sd
mean = 500
sd = 100
I hope this will help get you started.
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