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3 天前 · Comparisons of national income are also frequently made on the basis of purchasing power parity (PPP), to adjust for differences in the cost of living in different countries ( see List of countries by GDP (PPP) per capita ). PPP largely removes the exchange rate problem but not others; it does not reflect the value of economic output in international trade, and it also requires more estimation ...
3 天前 · Probability theory. In probability theory and statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is The parameter is the mean or expectation of the distribution (and also its median and mode ), while ...
2 天前 · Mercury is the first planet from the Sun and the smallest in the Solar System. In English, it is named after the ancient Roman god Mercurius ( Mercury ), god of commerce and communication, and the messenger of the gods. Mercury is classified as a terrestrial planet, with roughly the same surface gravity as Mars.
2 天前 · Marco Polo ( / ˈmɑːrkoʊ ˈpoʊloʊ / ⓘ, Venetian: [ˈmaɾko ˈpolo], Italian: [ˈmarko ˈpɔːlo] ⓘ; c. 1254 – 8 January 1324) [1] was a Venetian merchant, explorer and writer who travelled through Asia along the Silk Road between 1271 and 1295.
1 天前 · Coordinates: 4°N 56°W. Suriname ( / ˈsʊərɪnæm, - nɑːm / ⓘ SOOR-ih-NAM, -NAHM, Dutch: [syːriˈnaːmə] ⓘ ), officially the Republic of Suriname ( Dutch: Republiek Suriname [reːpyˌblik ˌsyːriˈnaːmə] ), is a country in northern South America, sometimes considered part of the Caribbean and the West Indies.
3 天前 · This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for duplex, bidirectional traffic. They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they ...
2 天前 · In probability theory and statistics, the Poisson distribution is a discrete probability distribution that expresses the probability of a given number of events occurring in a fixed interval of time if these events occur with a known constant mean rate and independently of the time since the last event. [1] .
