Hi,

r the standard normal curve, find the z-score that corresponds to the 90th percentile?

Excel function NORMSINV(.90) = 1.2816



Important to Understand z -values as they relate to the Standard Normal curve:

Below:  z = 0, z = ± 1, z= ±2 , z= ±3 are plotted.  

Note: z = 0 (x value the mean) 50% of the area under the curve is to the left and 50%  to the right



 

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