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Middle gray. 50% CIELAB lightness. ( Y = 18.4%) In photography, painting, and other visual arts, middle gray or middle grey is a tone that is perceptually about halfway between black and white on a lightness scale; [1] in photography and printing, it is typically defined as 18% reflectance in visible light. [2] [3]
At the conclusion of its rate-setting policy meeting on March 20, 2024, the Fed left the federal funds target interest rate of 5.25% to 5.50% unchanged, marking the fifth consecutive time it’s ...
Deforestation in Colombia's Amazon region is forecast to have declined by 25% to 35% in 2023, Environment Minister Susana Muhamad said on Monday, while warning that evidence shows that destruction ...
Jamaica ( / dʒəˈmeɪkə / ⓘ jə-MAY-kə; Jamaican Patois: Jumieka [dʒʌˈmie̯ka]) is an island country in the Caribbean Sea and the West Indies. At 10,990 square kilometres (4,240 sq mi), it is the third largest island—after Cuba and Hispaniola —of the Greater Antilles and the Caribbean. [11] Jamaica lies about 145 km (90 mi) south ...
In 2018, Mercedes-Benz was the largest brand of premium vehicles in the world, having sold 2.31 million passenger cars. [8] The brand's origins lie in Daimler-Motoren-Gesellschaft 's 1901 Mercedes and Carl Benz 's 1886 Benz Patent-Motorwagen, which is widely regarded as the first internal combustion engine in a self-propelled automobile. The ...
T[hh][mm] in basic format or T[hh]:[mm] in extended format, when seconds are omitted. T[hh], when both seconds and minutes are omitted. As of ISO 8601-1:2019/Amd 1:2022, "00:00:00" may be used to refer to midnight corresponding to the instant at the beginning of a calendar day; and "24:00:00" to refer to midnight corresponding to the instant at ...
The Positive predictive value (PPV) of a test is the proportion of persons who are actually positive out of all those testing positive, and can be calculated from a sample as: PPV = True positive / Tested positive. If sensitivity, specificity, and prevalence are known, PPV can be calculated using Bayes theorem.