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  2. Black Death - Wikipedia

    en.wikipedia.org/wiki/Black_Death

    25,000,000 – 50,000,000 (estimated) The Black Death was a bubonic plague pandemic occurring in Europe from 1346 to 1353. It was one of the most fatal pandemics in human history; as many as 50 million people [2] perished, perhaps 50% of Europe's 14th century population. [3] The disease is caused by the bacterium Yersinia pestis and spread by ...

  3. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    The standard deviation σ of X is defined as which can be shown to equal. Using words, the standard deviation is the square root of the variance of X . The standard deviation of a probability distribution is the same as that of a random variable having that distribution. Not all random variables have a standard deviation.

  4. Ferrari - Wikipedia

    en.wikipedia.org/wiki/Ferrari

    Ferrari S.p.A. ( / fəˈrɑːri /; Italian: [ferˈraːri]) is an Italian luxury sports car manufacturer based in Maranello, Italy. Founded in 1939 by Enzo Ferrari (1898–1988), the company built its first car in 1940, adopted its current name in 1945, and began to produce its current line of road cars in 1947. Ferrari became a public company ...

  5. List of United States cities by crime rate - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States...

    The number of murders includes nonnegligent manslaughter. This list is based on the reporting. In most cases, the city and the reporting agency are identical. However, in some cases such as Charlotte, Honolulu, and Las Vegas, the reporting agency has more than one municipality. Murder is the only statistic that all agencies are required to report.

  6. Academic grading in the United States - Wikipedia

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

    Papua New Guinea. v. t. e. 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 ...

  7. Sickle cell disease - Wikipedia

    en.wikipedia.org/wiki/Sickle_cell_disease

    Sickle cell disease ( SCD ), also simply called sickle cell, is a group of hemoglobin-related blood disorders typically inherited. [2] The most common type is known as sickle cell anemia. [2] It results in an abnormality in the oxygen-carrying protein haemoglobin found in red blood cells. [2] This leads to a rigid, sickle -like shape under ...

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