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  2. Median - Wikipedia

    en.wikipedia.org/wiki/Median

    The median of a finite list of numbers is the "middle" number, when those numbers are listed in order from smallest to greatest. If the data set has an odd number of observations, the middle one is selected (after arranging in ascending order). For example, the following list of seven numbers, 1, 3, 3, 6, 7, 8, 9

  3. Mediant (mathematics) - Wikipedia

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

    In mathematics, the mediant of two fractions, generally made up of four positive integers. and is defined as + +.. That is to say, the numerator and denominator of the mediant are the sums of the numerators and denominators of the given fractions, respectively.

  4. Interquartile range - Wikipedia

    en.wikipedia.org/wiki/Interquartile_range

    Each quartile is a median [8] calculated as follows. Given an even 2n or odd 2n+1 number of values first quartile Q 1 = median of the n smallest values third quartile Q 3 = median of the n largest values [8] The second quartile Q 2 is the same as the ordinary median. [8]

  5. Average - Wikipedia

    en.wikipedia.org/wiki/Average

    In ordinary language, an average is a single number or value that best represents a set of data. The type of average taken as most typically representative of a list of numbers is the arithmetic mean – the sum of the numbers divided by how many numbers are in the list. For example, the mean or average of the numbers 2, 3, 4, 7, and 9 (summing ...

  6. Parents are stumped over first grader’s math question - can ...

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    The problem required the student to split the number 27 into tens and ones and then just into ones. ... Lilly-Mo, was asked on the worksheet to pick the odd item out based on the five items she ...

  7. Quartile - Wikipedia

    en.wikipedia.org/wiki/Quartile

    If there are an odd number of data points in the original ordered data set, include the median (the central value in the ordered list) in both halves. If there are an even number of data points in the original ordered data set, split this data set exactly in half. The lower quartile value is the median of the lower half of the data.

  8. Median graph - Wikipedia

    en.wikipedia.org/wiki/Median_graph

    The median of three vertices in a tree, showing the subtree formed by the union of shortest paths between the vertices. Every tree is a median graph. To see this, observe that in a tree, the union of the three shortest paths between pairs of the three vertices a, b, and c is either itself a path, or a subtree formed by three paths meeting at a single central node with degree three.

  9. Selection algorithm - Wikipedia

    en.wikipedia.org/wiki/Selection_algorithm

    When is an odd number, the median of the collection is obtained by setting = (+) /. When n {\displaystyle n} is even, there are two choices for the median, obtained by rounding this choice of k {\displaystyle k} down or up, respectively: the lower median with k = n / 2 {\displaystyle k=n/2} and the upper median with k = n / 2 + 1 {\displaystyle ...

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