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  2. Expected value - Wikipedia

    en.wikipedia.org/wiki/Expected_value

    Then it follows that X + takes value 2k−1 with probability 6((2k−1)π) −2 for each positive integer k, and takes value 0 with remaining probability. Similarly, X − takes value 2k with probability 6(2kπ) −2 for each positive integer k and takes value 0 with remaining probability.

  3. Variance - Wikipedia

    en.wikipedia.org/wiki/Variance

    The expected value of X is (+ + + + +) / = / Therefore, the variance of X is ... This expression can be used to calculate the variance in situations where the CDF, ...

  4. Scientific notation - Wikipedia

    en.wikipedia.org/wiki/Scientific_notation

    A Texas Instruments TI-84 Plus calculator display showing the Avogadro constant to three significant figures in E notation. The first pocket calculators supporting scientific notation appeared in 1972. [14] To enter numbers in scientific notation calculators include a button labeled "EXP" or "×10 x", among other variants.

  5. Quadratic formula - Wikipedia

    en.wikipedia.org/wiki/Quadratic_formula

    The roots of the quadratic function y = ⁠ 1 / 2 ⁠ x 2 − 3x + ⁠ 5 / 2 ⁠ are the places where the graph intersects the x-axis, the values x = 1 and x = 5. They can be found via the quadratic formula. In elementary algebra, the quadratic formula is a closed-form expression describing the solutions of a quadratic equation.

  6. Lambert W function - Wikipedia

    en.wikipedia.org/wiki/Lambert_W_function

    The product logarithm Lambert W function plotted in the complex plane from −2 − 2i to 2 + 2i The graph of y = W(x) for real x < 6 and y > −4. The upper branch (blue) with y ≥ −1 is the graph of the function W 0 (principal branch), the lower branch (magenta) with y ≤ −1 is the graph of the function W −1. The minimum value of x is ...

  7. Methods of computing square roots - Wikipedia

    en.wikipedia.org/wiki/Methods_of_computing...

    This will be the current value c. Find p, y and x, as follows: Let p be the part of the root found so far, ignoring any decimal point. (For the first step, p = 0.) Determine the greatest digit x such that (+). We will use a new variable y = x(20p + x). Note: 20p + x is simply twice p, with the digit x appended to the right.

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  9. Pearson correlation coefficient - Wikipedia

    en.wikipedia.org/wiki/Pearson_correlation...

    The correlation sign is determined by the regression slope: a value of +1 implies that all data points lie on a line for which Y increases as X increases, whereas a value of -1 implies a line where Y increases while X decreases. [15] A value of 0 implies that there is no linear dependency between the variables. [16] More generally, (X i − X ...