Question: The distribution has only two parameters and 2 (or ). These are, in fact, the mean and variance (or standard deviation) of the distribution.

The distribution has only two parameters μ and σ2 (or σ). These are, in fact, the mean and variance (or standard deviation) of the distribution. Thus, knowing the values of these two parameters completely determines the distribution. The fact that these parameters are also the two most frequently used descriptive measures is a major reason why the normal distribution is so popular.

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