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单词	normal distribution
释义	normal distribution noun : a probability density function that approximates the distribution of many random variables (such as the proportion of outcomes of a particular kind in a large number of independent repetitions of an experiment in which the probabilities remain constant from trial to trial) and that has the form {latex}f(x) = \\frac{1}{\\sqrt{2\\pi\\sigma^{2}}}e^{-\\frac{(x - \\mu)^{2}}{2\\sigma^{2}}}{/latex} where μ is the mean and σ is the standard deviation compare normal curve Example Sentences Recent Examples on the Web One consequence of this is that the normal distribution, or bell curve, which says Black Swan events are highly unlikely to happen, no longer holds true. Jemma Green, Forbes, 4 Aug. 2022 Robert Rohde, a climate scientist at Berkeley Earth, prepared the chart below, showing Tuesday’s 104.4 degrees (40.2 Celsius) far, far off the normal distribution: A normal summer high temperature near London is about 20-25 °C (68-77 °F). Jacob Feuerstein, Washington Post, 20 July 2022 The question is not whether a sum of small, independent values would be likely to follow a normal distribution. Jessica Riskin, The New York Review of Books, 21 Apr. 2022 Launching in Singapore and getting to 12 countries would be the normal distribution area for Pixel phones. Ron Amadeo, Ars Technica, 3 Feb. 2022 But this is no longer the case: Instead of a normal distribution, now the distribution of voters is more barbelled, with a hollow center and the center of gravity for each party far from the center of the other. Noah Millman, The Week, 12 Oct. 2021 Thinking back to statistics class, remember the normal distribution curve where most people scored in the middle and there were some outliers who performed really badly and others who excelled and got more than 98%? Nida Leardprasopsuk, Forbes, 13 Oct. 2021 As seen in the NASA illustration below of a normal distribution of temperatures, or bell curve, as the average temperature of the planet warms, the curve shifts right. Jeff Berardelli, CBS News, 14 June 2021 Picture a bell curve—the graph that illustrates a normal distribution, with most of the data congregating at the center, with long tails at the high and low ends. Caroline Delbert, Popular Mechanics, 14 June 2021 See More Word History First Known Use 1897, in the meaning defined above
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