statistics

For a population of μ = 70 and σ = 20, find the z-score and percentile rank for each of the following X scores: 80, 100, 65, 40.

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  1. dont know

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  2. z=(x-μ)/σ

    Find the p-value of each z-score by looking it up in the z chart.

    It'll help you determine the percentile rank if you draw the normal distribution curve.

    http://www.mathsisfun.com/data/standard-normal-distribution-table.html

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  3. μ = 70 and σ = 20

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