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4、首先生成正态分布N?0,16?的容量为300的随机数的样本，然后画正态分布N?0,16?的直方图。
解：编程求解：>> x=normrnd(0,16,300,1); >> hist(x,7) 图像：
1009080706050403020100-40-200x204060y
练习5.5