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  2. Quartile - Wikipedia

    en.wikipedia.org/wiki/Quartile

    The first quartile (Q 1) is defined as the 25th percentile where lowest 25% data is below this point. It is also known as the lower 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

  3. Truncated mean - Wikipedia

    en.wikipedia.org/wiki/Truncated_mean

    The scoring method used in many sports that are evaluated by a panel of judges is a truncated mean: discard the lowest and the highest scores; calculate the mean value of the remaining scores. [ 10 ] The Libor benchmark interest rate is calculated as a trimmed mean: given 18 responses, the top 4 and bottom 4 are discarded, and the remaining 10 ...

  4. Quantile - Wikipedia

    en.wikipedia.org/wiki/Quantile

    Therefore, 6 is the rank in the population (from least to greatest values) at which approximately 2/4 of the values are less than the value of the second quartile (or median). The sixth value in the population is 9. 9 Third quartile The third quartile value for the original example above is determined by 11×(3/4) = 8.25, which rounds up to 9.

  5. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    The entire fraction may be expressed as a single composition, in which case it is hyphenated, or as a number of fractions with a numerator of one, in which case they are not. (For example, two-fifths is the fraction2 / 5 ⁠ and two fifths is the same fraction understood as 2 instances of ⁠ 1 / 5 ⁠.) Fractions should always be ...

  6. Fractional factorial design - Wikipedia

    en.wikipedia.org/wiki/Fractional_factorial_design

    Each generator halves the number of runs required. A design with p such generators is a 1/(l p)=l −p fraction of the full factorial design. [3] For example, a 2 52 design is 1/4 of a two-level, five-factor factorial design. Rather than the 32 runs that would be required for the full 2 5 factorial experiment, this experiment requires only ...

  7. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    Stock A over the past 20 years had an average return of 10 percent, with a standard deviation of 20 percentage points (pp) and Stock B, over the same period, had average returns of 12 percent but a higher standard deviation of 30 pp. On the basis of risk and return, an investor may decide that Stock A is the safer choice, because Stock B's ...

  8. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    The following list includes a decimal expansion and set ... 1, 1, 1, 2 2, 3 2, 13 2, 129 2 ... The continued fraction expansion has the pattern [2; 1, 2, 1, 1 ...

  9. Half-life - Wikipedia

    en.wikipedia.org/wiki/Half-life

    Fraction remaining Percentage remaining 0: 1 ⁄ 1: 100: 1: 1 ⁄ 2: 50: 2: 1 ⁄ 4: 25: 3: 1 ... ⁠ Hence, the half-life of a first order reaction is given as the ...