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The oldest known tables using a base of 10 are the Chinese decimal multiplication table on bamboo strips dating to about 305 BC, during China's Warring States period. [2] "Table of Pythagoras" on Napier's bones [3] The multiplication table is sometimes attributed to the ancient Greek mathematician Pythagoras (570–495 BC).
Year Yet questions. If you want help or explanations as you go along, turn to the chapter in PART TWO that relates to the question you're working on. 2. Read Part One and Part Two as preparation for your workshop, perhaps making notes as you read. When you've finished, set aside three hours and write your answers to the questions in Part Three.
The 25th percentile is also known as the first quartile (Q 1), the 50th percentile as the median or second quartile (Q 2), and the 75th percentile as the third quartile (Q 3). For example, the 50th percentile (median) is the score below (or at or below , depending on the definition) which 50% of the scores in the distribution are found.
The manuscript left many significant questions about networks unresolved, and one of these was the number of degrees of separation in actual social networks. Milgram took up the challenge on his return from Paris , leading to the experiments reported in The Small World Problem [ 9 ] in popular science journal Psychology Today , with a more ...
David Alexander Johnston (December 18, 1949 – May 18, 1980) was an American United States Geological Survey (USGS) volcanologist who was killed by the 1980 eruption of Mount St. Helens in the U.S. state of Washington.
Some ethnic groups, such as Asian-Americans and African-Americans, were up to 100 times more likely to be misidentified than white men. [ 116 ] A 2018 study in the journal Proceedings of the National Academy of Sciences found that tall young black men are especially likely to receive unjustified attention by law enforcement. [ 117 ]
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