在学习CFA考试中你可以发现需要学习10个科目的知识，不知道你2020年CFA数量分析学习的怎么样呢？今天融跃老师为各位准备了一道考题！看看你会不会呢？

A group of investors wants to be sure to always earn at least a 5% rate of return on their investments. They are looking at an investment that has a normally distributed probability distribution with an expected rate of return of 10% and a standard deviation of 5%. The probability of meeting or exceeding the investors' desired return in any given year is closest to:___


期望值减去1倍标准差刚好就是要求的收益率5%，达到或超过5%的概率就是收益率超过期望值减去1倍标准差的概率。正态分布，收益率介于期望值减去1倍标准差到期望值加上1倍标准差的这个区间的概率是68%，再加上右边尾巴的面积（1-68%）/2=16%，期望值减去1倍标准差右边的面积（概率）就是68%+16%=84%。