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Boxplot (with an interquartile range) and a probability density function (pdf) of a Normal N(0,σ 2) Population. In descriptive statistics, the interquartile range (IQR) is a measure of statistical dispersion, which is the spread of the data. [1] The IQR may also be called the midspread, middle 50%, fourth spread, or H‑spread.
Date range Excel supports dates with years in the range 1900–9999, except that December 31, 1899, can be entered as 0 and is displayed as 0-jan-1900. Converting a fraction of a day into hours, minutes and days by treating it as a moment on the day January 1, 1900, does not work for a negative fraction.
The kilogram was defined by a cylinder of platinum-iridium alloy until a new definition in terms of natural physical constants was adopted in 2019. As of 2022, the range of decimal prefixes has been extended to those for 10 30 (quetta–) and 10 −30 (quecto–). [44]
In chemistry the negative of the decimal logarithm, the decimal cologarithm, is indicated by the letter p. [63] For instance, pH is the decimal cologarithm of the activity of hydronium ions (the form hydrogen ions H + take in water). [64] The activity of hydronium ions in neutral water is 10 −7 mol·L −1, hence a pH of 7. Vinegar typically ...
The United States dollar is fully decimal, being divided into 10 dimes, 100 cents (¢), and (for accounting purposes) 1000 mills (₥); [73] this mirrors the decimal divisions of metric units with the prefixes deci-, centi-, and milli-. Coins are currently minted in 1, 5, 10, 25, 50, and 100-cent increments. [74]
The Muisca Confederation was a loose confederation of different Muisca rulers (zaques, zipas, iraca, and tundama) in the central Andean highlands of what is today Colombia before the Spanish conquest of northern South America.
The "Number Forms" block of the Unicode computer character set standard has a number of Roman numeral symbols in the range of code points from U+2160 to U+2188. [79] This range includes both upper- and lowercase numerals, as well as pre-combined characters for numbers up to 12 (Ⅻ or XII). One justification for the existence of pre-combined ...
The part being checked must pass through the first gap and must stop at the second gap in order to be within specification. The two gaps accurately reflect the top and bottom of the tolerance range. Bore micrometer, typically a three-anvil head on a micrometer base used to accurately measure inside diameters.