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  2. Black–Scholes model - Wikipedia

    en.wikipedia.org/wiki/Black–Scholes_model

    The Black–Scholes / ˌblæk ˈʃoʊlz / [1] or Black–Scholes–Merton model is a mathematical model for the dynamics of a financial market containing derivative investment instruments. From the parabolic partial differential equation in the model, known as the Black–Scholes equation, one can deduce the Black–Scholes formula, which gives ...

  3. Geometric mean - Wikipedia

    en.wikipedia.org/wiki/Geometric_mean

    The geometric mean can be an unreliable measure of central tendency for a dataset where one or more values are extremely close to zero in comparison to the other members of the dataset. The geometric mean of two numbers, say 2 and 8, is just the square root of their product, that is, . The geometric mean of the three numbers 4, 1, and 1/32 is ...

  4. HP 48 series - Wikipedia

    en.wikipedia.org/wiki/HP_48_series

    Dimensions. 17.9×7.9×2.8 cm (7.05×3.11×1.1 inch) The HP 48 is a series of graphing calculators designed and produced by Hewlett-Packard from 1990 until 2003. [1] The series includes the HP 48S, HP 48SX, HP 48G, HP 48GX, and HP 48G+, the G models being expanded and improved versions of the S models. The models with an X suffix are expandable ...

  5. Free Shipping Day - Wikipedia

    en.wikipedia.org/wiki/Free_Shipping_Day

    Online shoppers spent $942 million to make Free Shipping Day the third highest spending day of the 2010 holiday season, ultimately boosting online sales 61 percent from 2009. In 2011, Free Shipping Day became a billion-dollar shopping holiday with $1.072 billion in sales, followed by $1.01 billion during Free Shipping Day 2012.

  6. Tax return - Wikipedia

    en.wikipedia.org/wiki/Tax_return

    A tax return is a form on which a person or organization presents an account of income and circumstances, used by the tax authorities to determine liability for taxes. [1] [2] Tax returns are usually processed by each country's tax authority, known as a revenue service , such as the Internal Revenue Service in the United States, the State ...

  7. Return to Dark Tower - Wikipedia

    en.wikipedia.org/wiki/Return_to_Dark_Tower

    Return to Dark Tower is a board game for one to four players, designed and published by Restoration Games. The game is a sequel to the 1981 board game Dark Tower , by Milton Bradley Company . Return to Dark Tower has players cooperate or compete as they rule over kingdoms surrounding the titular Tower, with their chosen "heroes" gathering ...