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  2. Percentile - Wikipedia

    en.wikipedia.org/wiki/Percentile

    The percentile values for the ordered list {15, 20, 35, 40, 50} One definition of percentile, often given in texts, is that the P-th percentile (<) of a list of N ordered values (sorted from least to greatest) is the smallest value in the list such that no more than P percent of the data is strictly less than the value and at least P percent of ...

  3. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    If a data distribution is approximately normal then about 68 percent of the data values are within one standard deviation of the mean (mathematically, μ ± σ, where μ is the arithmetic mean), about 95 percent are within two standard deviations (μ ± 2σ), and about 99.7 percent lie within three standard deviations (μ ± 3σ).

  4. 50% Off - Wikipedia

    en.wikipedia.org/wiki/50%_Off

    "50% Off" is the second episode of the fifth season of the AMC television series Better Call Saul, a spin-off series of Breaking Bad. The episode aired on February 24, 2020, on AMC, in the United States. Outside of the United States, the episode premiered on the streaming service Netflix in several countries.

  5. Distribution of wealth - Wikipedia

    en.wikipedia.org/wiki/Distribution_of_wealth

    These are the topmost point (1, 100) by definition, and the rightmost point (poorest people, lowest wealth) or (p=100, w=0) or (100, 0). This unfortunate rightmost point is given because there are always at least one percent of households (incarcerated, long term illness, etc.) with no wealth at all.

  6. Efficient energy use - Wikipedia

    en.wikipedia.org/wiki/Efficient_energy_use

    Tight building design, including energy-efficient windows, well-sealed doors, and additional thermal insulation of walls, basement slabs, and foundations can reduce heat loss by 25 to 50 percent. [25] [30] Dark roofs may become up to 39 °C (70 °F) hotter than the most reflective white surfaces. They transmit some of this additional heat ...

  7. Academic grading in the United States - Wikipedia

    en.wikipedia.org/wiki/Academic_grading_in_the...

    The top grade, A, is given here for performance that exceeds the mean by more than 1.5 standard deviations, a B for performance between 0.5 and 1.5 standard deviations above the mean, and so on. [18] Regardless of the absolute performance of the students, the best score in the group receives a top grade and the worst score receives a failing grade.

  8. Quartile - Wikipedia

    en.wikipedia.org/wiki/Quartile

    The second quartile (Q 2) is the median of a data set; thus 50% of the data lies below this point. The third quartile (Q 3) is the 75th percentile where lowest 75% data is below this point. It is known as the upper quartile, as 75% of the data lies below this point. [1]

  9. Wealth inequality in the United States - Wikipedia

    en.wikipedia.org/wiki/Wealth_inequality_in_the...

    [31] [32] The Urban-Brookings Tax Policy Center found that the bottom 20 percent of earners pay an average 2.9 percent effective income tax rate federally, while the richest 1 percent paid an effective 29.6 percent tax rate and the top 0.01 percent paid an effective 30.6 percent tax rate. [33]