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The normal, or Gaussian, distribution has a density function that is a symmetrical bell-shaped curve. It is one of the most important distributions in statistics. Use the [normality-assumption] tag for asking about testing for normality.
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When to use which random variable?
Given a population ($\Omega,A,P$) and a random variable $X : \Omega \to \mathbb{R}$ defined on it, we want to predict the distribution of $X$ intuitively.Once we know that $X$ follows a particular di …