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2. Percentile rank - Wikipedia

   en.wikipedia.org/wiki/Percentile_rank

   The figure illustrates the percentile rank computation and shows how the 0.5 × F term in the formula ensures that the percentile rank reflects a percentage of scores less than the specified score. For example, for the 10 scores shown in the figure, 60% of them are below a score of 4 (five less than 4 and half of the two equal to 4) and 95% are ...

3. Percentile - Wikipedia

   en.wikipedia.org/wiki/Percentile

   The 25th percentile is also known as the first quartile (Q 1), the 50th percentile as the median or second quartile (Q 2), and the 75th percentile as the third quartile (Q 3). For example, the 50th percentile (median) is the score below (or at or below , depending on the definition) which 50% of the scores in the distribution are found.

4. Income inequality metrics - Wikipedia

   en.wikipedia.org/wiki/Income_inequality_metrics

   Income of a given percentage as a ratio to median, for 10th (red), 20th, 50th, 80th, 90th, and 95th (grey) percentile, for 1967–2003 in the United States (50th percentile is 1:1 by definition) Particularly common to compare a given percentile to the median, as in the first chart here; compare seven-number summary , which summarizes a ...

5. Quartile - Wikipedia

   en.wikipedia.org/wiki/Quartile

   The first quartile (Q 1) is defined as the 25th percentile where lowest 25% data is below this point. It is also known as the lower quartile. The second quartile (Q 2) is the median of a data set; thus 50% of the data lies below this point. The third quartile (Q 3) is the 75th percentile where

6. List of European countries by average wage - Wikipedia

   en.wikipedia.org/wiki/List_of_European_countries...

   Salary Survey; Salary in Germany; Eurostat: Wages and labour costs; Eurostat: Minimum wages August 2011; FedEE;Pay in Europe 2010; Wages (statutory minimum, average monthly gross, net) and labour cost (2005) CE Europe; Wages and Taxes for the Average Joe in the EU 27 2009; Moldovans have lowest wages in Europe; UK Net Salary Calculator

7. 68–95–99.7 rule - Wikipedia

   en.wikipedia.org/wiki/68–95–99.7_rule

   Diagram showing the cumulative distribution function for the normal distribution with mean (μ) 0 and variance (σ 2) 1. These numerical values "68%, 95%, 99.7%" come from the cumulative distribution function of the normal distribution.