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  2. 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.

  3. 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.

  4. 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 ...

  5. Confidence interval - Wikipedia

    en.wikipedia.org/wiki/Confidence_interval

    Each row of points is a sample from the same normal distribution. The colored lines are 50% confidence intervals for the mean, μ. At the center of each interval is the sample mean, marked with a diamond. The blue intervals contain the population mean, and the red ones do not.

  6. Facebook - Wikipedia

    en.wikipedia.org/wiki/Facebook

    Facebook's initial public offering came on May 17, 2012, at a share price of US$38 ($50.00 in 2023 dollars [20] ). The company was valued at $104 billion ($138 billion in 2023 dollars [20] ), the largest valuation to that date.