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  2. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    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 ...

  3. Division (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Division_(mathematics)

    Division is one of the four basic operations of arithmetic. The other operations are addition, subtraction, and multiplication. What is being divided is called the dividend, which is divided by the divisor, and the result is called the quotient. At an elementary level the division of two natural numbers is, among other possible interpretations ...

  4. List of exoplanets discovered in 2024 - Wikipedia

    en.wikipedia.org/wiki/List_of_exoplanets...

    5.9 ± 2.2 1.19 ± 0.36 microlensing 25,070 ± 2930 0.63 ± 0.23 Another solution suggests a larger semi-major axis, of 2.09 ± 0.63 AU. OGLE-2023-BLG-0836Lb 4.36 +2.35 −2.2: 3.7 +11.2: microlensing 16,690 +4430 −5250: The planet is located in a binary star system, and is likely to be orbiting both stars in the system. S1429 b 1.8 ± 0. ...

  5. Standard normal table - Wikipedia

    en.wikipedia.org/wiki/Standard_normal_table

    Standard normal table. In statistics, a standard normal table, also called the unit normal table or Z table, [1] is a mathematical table for the values of Φ, the cumulative distribution function of the normal distribution. It is used to find the probability that a statistic is observed below, above, or between values on the standard normal ...

  6. Chi-squared distribution - Wikipedia

    en.wikipedia.org/wiki/Chi-squared_distribution

    These values can be calculated evaluating the quantile function (also known as "inverse CDF" or "ICDF") of the chi-squared distribution; e. g., the χ 2 ICDF for p = 0.05 and df = 7 yields 2.1673 ≈ 2.17 as in the table above, noticing that 1 – p is the p-value from the table. History

  7. 2 euro coin - Wikipedia

    en.wikipedia.org/wiki/2_euro_coin

    The 2 euro coin ( €2) is the highest-value euro coin and has been used since the introduction of the euro (in its cash form) in 2002. [2] The coin is made of two alloys: the inner part of nickel brass, the outer part of copper-nickel. All coins have a common reverse side and country-specific national sides.

  8. Orders of magnitude (numbers) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(numbers)

    Mathematics – Poker: The odds of being dealt a royal flush in poker are 649,739 to 1 against, for a probability of 1.5 × 10 −6 (0.000 15%). Mathematics – Poker: The odds of being dealt a straight flush (other than a royal flush) in poker are 72,192 to 1 against, for a probability of 1.4 × 10 −5 (0.0014%).

  9. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    For example, to calculate 2 × 167: 2×7=14, so the final digit is 4, with a 1 carried and added to the 2×6 = 12 to give 13, so the next digit is 3 with a 1 carried and added to the 2×1=2 to give 3. Thus, the product is 334. Multiplying by 5. To multiply a number by 5, 1. First multiply that number by 10, then divide it by 2.