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。
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。
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