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  2. Return period - Wikipedia

    en.wikipedia.org/wiki/Return_period

    The theoretical return period between occurrences is the inverse of the average frequency of occurrence. 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.

  3. Educational stage - Wikipedia

    en.wikipedia.org/wiki/Educational_stage

    In some areas in England, a three-tier system of education is used, in which students pass through three stages: First school / Lower school (Reception to Year 3/4), Middle school (Year 4/5 to Year 7/8) and finally High or Upper School (Year 8/9–Year 13) Key stage. Year. Final exam.

  4. United States Consumer Price Index - Wikipedia

    en.wikipedia.org/wiki/United_States_Consumer...

    However, from December 1982 through December 2011, the all-items CPI-E rose at an annual average rate of 3.1 percent, compared with increases of 2.9 percent for both the CPI-U and CPI-W. [28] This suggests that the elderly have been losing purchasing power at the rate of roughly 0.2 (=3.12.9) percentage points per year.

  5. British undergraduate degree classification - Wikipedia

    en.wikipedia.org/wiki/British_undergraduate...

    The upper division is commonly abbreviated to "2:1" or "II.i" (pronounced two-one). The 2:1 is a minimum requirement for entry to many postgraduate courses in the UK. It is also required for the award of a research council postgraduate studentship in the UK, although a combination of qualifications and experience equal to a 2:1 is also acceptable.

  6. Incidence (epidemiology) - Wikipedia

    en.wikipedia.org/wiki/Incidence_(epidemiology)

    Incidence proportion (IP), also known as cumulative incidence, is defined as the probability that a particular event, such as occurrence of a particular disease, has occurred in a specified period: [1] For example, if a population contains 1,000 persons and 28 develop a condition from the time the disease first occurred until two years later ...

  7. Paris Agreement - Wikipedia

    en.wikipedia.org/wiki/Paris_Agreement

    According to the report contrarily to expectations, the agreement has a significant effect: while in 2010 the expected temperature rise by 2100 was 3.7–4.8 °C, at COP 27 it was 2.4–2.6°C and if all countries will fulfill their long-term pledges 1.7–2.1 °C. However, the world remains very far from limiting warming to 1.5 degrees.

  8. Light-year - Wikipedia

    en.wikipedia.org/wiki/Light-year

    10 6: 2.5 × 10 6 ly: The Andromeda Galaxy is approximately 2.5 million light-years away. 3 × 10 6 ly: The Triangulum Galaxy , at about 3 million light-years away, is the most distant object visible to the naked eye. 5.9 × 10 7 ly: The nearest large galaxy cluster, the Virgo Cluster, is about 59 million light-years away. 1.5 × 10 8 – 2.5 ...

  9. World population - Wikipedia

    en.wikipedia.org/wiki/World_population

    The highest global population growth rates, with increases of over 1.8% per year, occurred between 1955 and 1975, peaking at 2.1% between 1965 and 1970. [3] The growth rate declined to 1.1% between 2015 and 2020 and is projected to decline further in the 21st century. [ 4 ]