Chi-squared distribution - Wikipedia

Chi square

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Chi-Squared Distribution, PDF, Chi Squared Distribution

Chi-squared distribution

Let X1, X2, and X3 be independent random variables with standard normal distribution. What is the density function of Y =X1^2+X2^2+X3^2? - Quora

Chi-squared distribution - Wikipedia

Inverse-chi-squared distribution - Wikipedia

Chi-Squared Distribution, PDF, Chi Squared Distribution