Hi,

Note:  Bell shaped Curve showing placement of z = 0, z = ±1, 2, 3 

Left or Right of z = 0 being 50% of the area under the standard normal curve...



As to A set of data is normally distributed with a mean of 100 and SD of 15. X = 90 

 z = (90-100)/15 =

Exel function NORMSDIST(-.6667) = .25 , 25% to the left and 75% to the right

What percentage of scores is between 100 and 90? 25%

· What would be the percentile rank for a score of 90? 25%

 

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