在學習CFA考試中你可以發現需要學習10個科目的知識，不知道你2020年CFA數量分析學習的怎么樣呢？今天融躍老師為各位準備了一道考題！看看你會不會呢？

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:___

期望值減去1倍標準差剛好就是要求的收益率5%，達到或超過5%的概率就是收益率超過期望值減去1倍標準差的概率。正態分布，收益率介于期望值減去1倍標準差到期望值加上1倍標準差的這個區間的概率是68%，再加上右邊尾巴的面積（1-68%）/2=16%，期望值減去1倍標準差右邊的面積（概率）就是68%+16%=84%。