Homework Help: statistics

Posted by Jessica on Sunday, July 29, 2012 at 11:48pm.

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?

statistics - MathGuru, Monday, July 30, 2012 at 5:25pm
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.

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