假设某股票1个月后的股价增长率服从均值为2%、方差为0.01%的正态分布,则1个月后该股票的股价增长率落在()区间内的概率约为68%。A.(1%,3%) ...

作者: tihaiku 人气: - 评论: 0
问题 假设某股票1个月后的股价增长率服从均值为2%、方差为0.01%的正态分布,则1个月后该股票的股价增长率落在()区间内的概率约为68%。
选项 A.(1%,3%) B. (0.4%, 0.6%) C. (1.99% ,2.01%) D. (1.98%,2.02%)
答案 A
解析 股价近似落在左右1倍标准差内,标准差为1%,即(2%-1%,2%+1%)。

相关内容:假设,股票,1个月,股价,增长率,均值,方差,正态分布,概率

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