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A pie chart showing the percentage by web browser visiting Wikimedia sites (April 2009 to 2012) In mathematics, a percentage (from Latin per centum 'by a hundred') is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign (%), [1] although the abbreviations pct., pct, and sometimes pc are also used. [2]
In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: approximately 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.
In statistics, a k-th percentile, also known as percentile score or centile, is a score below which a given percentage k of scores in its frequency distribution falls ("exclusive" definition) or a score at or below which a given percentage falls ("inclusive" definition); i.e. a score in the k-th percentile would be above approximately k% of all scores in its set.
From January 2008 to April 2010, if you bought shares in companies when John M. Deutch joined the board, and sold them when he left, you would have a -83.3 percent return on your investment, compared to a -17.8 percent return from the S&P 500.
From January 2008 to December 2012, if you bought shares in companies when Lester L. Lyles joined the board, and sold them when he left, you would have a -21.9 percent return on your investment, compared to a -2.8 percent return from the S&P 500.
To specify a percentage suffix (e.g. per cent) other than %, use |%=suffix, e.g. |%=per cent. To override the scientific notation default for very large and very small numbers, use |nonscinote=yes . To override the default right alignment in table mode, use |align=left or |align=center .
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