3 For many random variables, a good choice is the normal distribution, often represented as a bell-shaped curve, shown in Figure 1.
3对于许多随机变量来说，一个好的选择是正态分布，常常表现为一个钟型曲线，如图1所示。
However, for symmetrical, bell shaped distribution, we can be more precise in explaining the dispersion about the mean.
然而，为对称的钟形分布，我们可以更精确地解释有关平均值的分散。
However, for symmetrical, bell shaped distribution, we can be more precise in explaining the dispersion about the mean.
然而，为对称的钟形分布，我们可以更精确地解释有关平均值的分散。
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