Education Technology

Statistics: Percentiles
by Texas Instruments

Published on August 18, 2010


Students use the area to the left of a value in a normal distribution to find its percentile and then reverse the process to find the value for a given percentile.

Key Steps

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    In the first problem, students use the mean and standard deviation of a normal distribution to find the percentile of a given score.

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    In the second problem, students find the score given the percentile. Students reverse the method used in problem 1. This reversal is done by using a command called invNorm.

    Problem 3 allows students to apply what they learn by solving several scenarios. These scenarios include finding the higher percentile given two scores and their distribution, estimating a score, and finding a possible score.