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  2. Return period - Wikipedia

    en.wikipedia.org/wiki/Return_period

    For example, a 10-year flood has a 1/10 = 0.1 or 10% chance of being exceeded in any one year and a 50-year flood has a 0.02 or 2% chance of being exceeded in any one year. This does not mean that a 100-year flood will happen regularly every 100 years, or only once in 100 years. Despite the connotations of the name "return period".

  3. Grading systems by country - Wikipedia

    en.wikipedia.org/wiki/Grading_systems_by_country

    Colombia. The most used grading systems are the numerical from 0 to 5 or from 0 to 10 and commonly are approved with 3 or 6, respectively. The letter system consists of E, S, B, A, I and is approved with A. The letter system is based on the numerical, meaning that the numerical system guides the letter one.

  4. Education in the United States - Wikipedia

    en.wikipedia.org/wiki/Education_in_the_United_States

    This is an accepted version of this page This is the latest accepted revision, reviewed on 1 November 2024. Education in the United States of America National education budget (2023-24) Budget $222.1 billion (0.8% of GDP) Per student More than $11,000 (2005) General details Primary languages English System type Federal, state, local, private Literacy (2017 est.) Total 99% Male 99% Female 99% ...

  5. Visual acuity - Wikipedia

    en.wikipedia.org/wiki/Visual_acuity

    For 6/6 = 1.0 acuity, the size of a letter on the Snellen chart or Landolt C chart is a visual angle of 5 arc minutes (1 arc min = 1/60 of a degree), which is a 43 point font at 20 feet. [10] By the design of a typical optotype (like a Snellen E or a Landolt C), the critical gap that needs to be resolved is 1/5 this value, i.e., 1 arc min.

  6. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    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 ...

  7. Percentile - Wikipedia

    en.wikipedia.org/wiki/Percentile

    Percentile. Statistic which divides a data set into 100 parts and analyzes it as a percentage. 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 ...

  8. Basis point - Wikipedia

    en.wikipedia.org/wiki/Basis_point

    100 bp = 100‱, 10‰, 1%, 10 −2, ⁠ 1 / 100 ⁠, or 0.01. Basis points are used as a convenient unit of measurement in contexts where percentage differences of less than 1% are discussed. The most common example is interest rates , where differences in interest rates of less than 1% per year are usually meaningful to talk about.

  9. Century - Wikipedia

    en.wikipedia.org/wiki/Century

    According to the strict construction, the 1st century AD, which began with AD 1, ended with AD 100, and the 2nd century with AD 200; [note 1] in this model, the n-th century starts with a year that follows a year with a multiple of 100 (except the first century as it began after the year 1 BC) and ends with the next coming year with a multiple ...