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  2. Academic grading in the United States - Wikipedia

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

    In the United States, academic grading commonly takes on the form of five, six or seven letter grades. Traditionally, the grades are A+, A, A−, B+, B, B−, C+, C, C−, D+, D, D− and F, with A+ being the highest and F being lowest. In some cases, grades can also be numerical. Numeric-to-letter-grade conversions generally vary from system to system and between disciplines and status.

  3. Amazon rainforest - Wikipedia

    en.wikipedia.org/wiki/Amazon_rainforest

    The Amazon rainforest, [a] also called Amazon jungle or Amazonia, is a moist broadleaf tropical rainforest in the Amazon biome that covers most of the Amazon basin of South America. This basin encompasses 7,000,000 km 2 (2,700,000 sq mi), [2] of which 6,000,000 km 2 (2,300,000 sq mi) are covered by the rainforest. [3] This region includes territory belonging to nine nations and 3,344 formally ...

  4. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    The standard deviation of a random variable, sample, statistical population, data set, or probability distribution is the square root of its variance. It is algebraically simpler, though in practice less robust, than the average absolute deviation.

  5. Fourier transform - Wikipedia

    en.wikipedia.org/wiki/Fourier_transform

    An example application of the Fourier transform is determining the constituent pitches in a musicalwaveform. This image is the result of applying a constant-Q transform(a Fourier-related transform) to the waveform of a C majorpianochord. The first three peaks on the left correspond to the frequencies of the fundamental frequencyof the chord (C, E, G). The remaining smaller peaks are higher ...

  6. Steam (service) - Wikipedia

    en.wikipedia.org/wiki/Steam_(service)

    Steam is a video game digital distribution service and storefront developed by Valve Corporation. It was launched as a software client in September 2003 to provide game updates automatically for Valve's games, and expanded to distributing third-party titles in late 2005. Steam offers various features, like game server matchmaking with Valve ...

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