NO.PZ2018070201000044
问题如下:
What's the covariance between the two securities? Assuming the standard deviation of the portfolio is 27%.
选项:
A.7%
B.7.5%.
C.8%.
解释:
B is correct.
According to the result of last question, when portfolio's standard deviation is 27%, the correlation between the two securities is 1. The covariance is =(1.0)(30%)(25%)=7.50%.
请问能解释一下为什么得出 correlation 是1