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Janet1106 · 2020年05月09日

问一道题：NO.PZ2015120604000050

  1. CFA I
  2. Quantitative

问题如下：

The table below shows the monthly stock returns of Ivy Corp.

According to the above table , calculate the population standard deviation for Ivy Corp. returns, assuming the population has 6 observations?

选项：

A.

8.78%.

B.

8.01%.

C.

48.06%.

解释：

B is correct

σ = σ 2 = p o p u l a t i o n v a r i a n c e

Population variance is 64.2 as calculated in previous question, thus population standard deviation is 8.01, the square root of 64.2.

老师您好，这个答案显示没有算二月的，二月的不是4-7.7，答案算了三次12-7.7，是不是错了？populationvariance=n


∑(X−μ)2

​

=[(20- 7.7)2 + (12 - 7.7)2 + (-5 - 7.7)2 + (12- 7.7)2 + (3 - 7.7)2 + (12- 7.7)2] / 6 = 64.2%2

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1 个答案

星星_品职助教 · 2020年05月09日

同学你好，

你理解的正确。第二个应该是4-7.7。

不过这种题目不用手算的，按照上课讲的按计算器就可以啦。

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