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标准正态分布的概率密度函数为（ ）
·<img src=""https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20151130/1448891093305044382_QQ图片20151130214506.png"" 9015477552768824"" QQ图片20151130214506.png"">
·<img src=""https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20151130/1448891119736000536_QQ图片20151130214535.png"" 19847739376526463"" QQ图片20151130214535.png"">
·<img src=""https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20151130/1448891148102029241_QQ图片20151130214603.png"" 38058779132962495"" QQ图片20151130214603.png"">
·<img src=""https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/ueditor/jsp/upload/image/20151130/1448891221382071723_QQ图片20151130214713.png"" 24389061845424685"" QQ图片20151130214713.png"">"

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出自：佳木斯大学语言治疗学

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