标准正态分布曲线下区间(-1，+1)所对应的面积为（　　）A.15．86％ B.31．73％ C.68．27％ D.84．14％ E.需查U界值表

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问题标准正态分布曲线下区间(-1，+1)所对应的面积为（　　）

选项 A.15．86％ B.31．73％ C.68．27％ D.84．14％ E.需查U界值表

答案 C

解析

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文件: /twcms/kongphp/cache/cache_redis.class.php
位置: 第 85 行

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