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1975

Years: 1970 1971 1972 1973 1974 - 1975 - 1976 1977 1978 1979 1980

Events

Art, Culture & Fashion

Births

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 Chi-square distribution ... distribution with k degrees of freedom is the probability distribution of the random variable $\chi^2 = Z_1^2 + \cdots + Z_k^2$ where Z1, ..., Zk ...