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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Source:http://www.dummies.com/how-to/content/pmp-statistics-for-normal-and-cumulative-distribut.html
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