Z-scores A standard or z-score measures the distance between each item and the mean in terms of the number of standard deviations. This would return the area under a normal curve below 112 (to the left).This would return the area under a normal curve between 112 and 122 for a distribution that has a mean of 100 and a standard deviation of 15. Normalpdf( height of the curve The TI-83 provides three functions for Normal Distribution: normalcdf( area under the curve invNorm( score associated with the given areaĪrea or Probability Area under the Curvenormalcdf(low, high, mean, stdev)Returns the area under the curve (aka: probability, relative frequency)between the low and high scores. To access the TI-83 functions for Normal DistributionsPress 2ndand VARS Normal Distributionusing the TI-83 Graphing Calculator
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