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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.
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] A percentage is a dimensionless number (pure number), primarily used for expressing proportions ...
Percent of Norm Sample Theoretical Percent Included 130+ Upper Extreme 2.3 2.2 120–129 Well Above Average 7.4 6.7 110–119 Above Average 16.7 16.1 90–109 Average 49.5 50.0 80–89 Below Average 16.1 16.1 70–79 Well Below Average 6.1 6.7 below 70 Lower Extreme 2.1 2.2
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.
[3] [4] However, several aspects of the index have received criticism. Some scholars have criticized how the factors are weighed, in particular how an additional year of life expectancy is valued differently between countries; [ 4 ] [ 5 ] and the limited factors it considers, noting the omission of factors such as the levels of distributional ...
The global literacy rate for all people aged 15 and above is 86.3%. The global literacy rate for all males is 90.0%, and the rate for all females is 82.7%. The rate varies throughout the world, with developed nations having a rate of 99.2% (2013), South and West Asia having 70.2% (2015), and sub-Saharan Africa at 64.0% (2015). [ 1]
Intracellular fluid (2/3 of body water) is fluid contained within cells. In a 72 kg (159 lb) body containing 40 litres of fluid, about 25 litres is intracellular, [8] which amounts to 62.5%. Jackson's texts states 70% of body fluid is intracellular. [9] Extracellular fluid (1/3 of body water
25,000,000 – 50,000,000 (estimated) The Black Death was a bubonic plague pandemic occurring in Europe from 1346 to 1353. It was one of the most fatal pandemics in human history; as many as 50 million people [ 2] perished, perhaps 50% of Europe's 14th century population. [ 3] The disease is caused by the bacterium Yersinia pestis and spread by ...