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A gray card is a flat object of a neutral-gray color that derives from a flat reflectance spectrum. A typical example is the Kodak R-27 set, which contains one 8 in × 10 in (20 cm × 25 cm) card and one 4 in × 5 in (10 cm × 13 cm) card, each with an 18% reflectance across the visible spectrum, and a white reverse side with a 90% reflectance.
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In statistics, the 68–95–99.7 rule, also known as the empirical rule, and sometimes abbreviated 3ss, is a shorthand used to remember the percentage of values that lie within an interval estimate in a normal distribution: 68%, 95%, and 99.7% of the values lie within one, two, and three standard deviations of the mean, respectively.
In pattern recognition, information retrieval, object detection and classification (machine learning), precision and recall are performance metrics that apply to data retrieved from a collection, corpus or sample space . Precision (also called positive predictive value) is the fraction of relevant instances among the retrieved instances.
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50cent .com. Curtis James Jackson III (born July 6, 1975), [3] known professionally as 50 Cent, [n 1] is an American rapper, actor, television producer, and businessman. Born in South Jamaica, a neighborhood of Queens, Jackson began pursuing a musical career in 1996. In 1999-2000, he recorded his "debut" album Power of the Dollar for Columbia ...
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