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  2. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    3. Between two groups, may mean that the first one is a proper subgroup of the second one. > (greater-than sign) 1. Strict inequality between two numbers; means and is read as "greater than". 2. Commonly used for denoting any strict order. 3. Between two groups, may mean that the second one is a proper subgroup of the first one. ≤ 1.

  3. List of logic symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_logic_symbols

    := means "from now on, is defined to be another name for ." This is a statement in the metalanguage, not the object language. This is a statement in the metalanguage, not the object language. The notation a ≡ b {\displaystyle a\equiv b} may occasionally be seen in physics, meaning the same as a := b {\displaystyle a:=b} .

  4. Mean - Wikipedia

    en.wikipedia.org/wiki/Mean

    The arithmetic mean (or simply mean or average) of a list of numbers, is the sum of all of the numbers divided by their count.Similarly, the mean of a sample ,, …,, usually denoted by ¯, is the sum of the sampled values divided by the number of items in the sample.

  5. Five Ws - Wikipedia

    en.wikipedia.org/wiki/Five_Ws

    In the United Kingdom (excluding Scotland), the Five Ws are used in Key Stage 2 and Key Stage 3 lessons (ages 7–14). [6] In data analytics, the Five Ws are used in the first stage of the BADIR to identify the business problem and its context in an analytics request.

  6. 68–95–99.7 rule - Wikipedia

    en.wikipedia.org/wiki/68–95–99.7_rule

    In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3sr or 3 σ, 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 ...

  7. Generalized mean - Wikipedia

    en.wikipedia.org/wiki/Generalized_mean

    The unweighted means correspond to setting all w i = 1. ... (without loss in generality); [7] Differentiating the numerator and denominator with respect to p, ...

  8. What It Really Means When You Keep Seeing the Number 7 - AOL

    www.aol.com/really-means-keep-seeing-number...

    Seeing 7, 77, and 777 means you're getting a divine message from your guardian angel. The sign of encouragement is great, but before you move forward, there are steps to take so you harness these ...

  9. Expected value - Wikipedia

    en.wikipedia.org/wiki/Expected_value

    By induction, this means that the expected value of the sum of any finite number of random variables is the sum of the expected values of the individual random variables, and the expected value scales linearly with a multiplicative constant.