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  2. IQ classification - Wikipedia

    en.wikipedia.org/wiki/IQ_classification

    The highest score obtainable by direct look-up from the standard scoring tables (based on norms from the 1930s) was IQ 171 at various chronological ages from three years six months (with a test raw score "mental age" of six years and two months) up to age six years and three months (with a test raw score "mental age" of ten years and three ...

  3. Rough set - Wikipedia

    en.wikipedia.org/wiki/Rough_set

    In general, the upper and lower approximations are not equal; in such cases, we say that target set is undefinable or roughly definable on attribute set . When the upper and lower approximations are equal (i.e., the boundary is empty), P ¯ X = P _ X {\displaystyle {\overline {P}}X={\underline {P}}X} , then the target set X {\displaystyle X} is ...

  4. Upper and lower bounds - Wikipedia

    en.wikipedia.org/wiki/Upper_and_lower_bounds

    13934 and other numbers x such that x ≥ 13934 would be an upper bound for S. The set S = {42} has 42 as both an upper bound and a lower bound; all other numbers are either an upper bound or a lower bound for that S. Every subset of the natural numbers has a lower bound since the natural numbers have a least element (0 or 1, depending on ...

  5. Are You Upper, Middle, or Lower Class? 3 Ways to Find Out - AOL

    www.aol.com/upper-middle-lower-class-3-093011070...

    Middle class: $58,021 and $94,000. Upper-middle class: $94,000 and $153,000. Upper class: $153,001 or more. These are just a few of the factors that can help you figure out what class you may fall ...

  6. Interquartile range - Wikipedia

    en.wikipedia.org/wiki/Interquartile_range

    The lower quartile corresponds with the 25th percentile and the upper quartile corresponds with the 75th percentile, so IQR = Q 3 − Q 1 [1]. The IQR is an example of a trimmed estimator, defined as the 25% trimmed range, which enhances the accuracy of dataset statistics by dropping lower contribution, outlying points. [5]

  7. Minkowski content - Wikipedia

    en.wikipedia.org/wiki/Minkowski_content

    The Minkowski content (named after Hermann Minkowski), or the boundary measure, of a set is a basic concept that uses concepts from geometry and measure theory to generalize the notions of length of a smooth curve in the plane, and area of a smooth surface in space, to arbitrary measurable sets.

  8. The income you need to fall in America's lower, middle and ...

    www.aol.com/finance/income-fall-americas-lower...

    Half of Americans identify as middle or upper-middle class. But are they really? ... Lower class: less than or equal to $30,000. Lower-middle class: $30,001 – $58,020. Middle class: $58,021 ...

  9. What Income Makes You 'Upper Class'? Here's What You ... - AOL

    www.aol.com/income-makes-upper-class-heres...

    The upper class possesses nearly 67 times the net worth of the lower class. Here's a breakdown: Lower class: $12,000. Lower-middle class: $61,260. Middle class: $145,200. Upper-middle class ...