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PMP Statistics for Normal and Cumulative Distributions

Part of the PMP Certification All-In-One For Dummies Cheat Sheet

You must know some basic statistics for the PMP Certification exam. All equations are based on a normal distribution. In a normal distribution, keep the following in mind:

  • 68.3% of the data points fall within one standard deviation

  • 95.5% of the data points fall within two standard deviations

  • 99.7% of the data points fall within three standard deviations

If you're looking at a normal curve and need a cumulative distribution, you should remember these values:

  • 0.15% of the data points fall between 0 and -3σ from the mean

  • 2.25% of the data points fall between 0 and -2σ from the mean

  • 16% of the data points fall between 0 and -1σ from the mean

  • 84% of the data points fall between 0 and +1σ from the mean

  • 97.75% of the data points fall between 0 and +2σ from the mean

  • 99.85% of the data points fall between 0 and +3σ from the mean

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