You areconsidering the following two stocks for your portfolio and have observed thefollowing.

The risk freerate is 0.04 and you are considering investing 60% of your funds in Stock A and40% in Stock B.

a)     Coefficient of Variation of Stock A
b)     Coefficient of Variation of Stock B
c)     Covariance of Stocks A and B
d)    Correlation Coefficient of Stocks A andB   这问老师最后的答案是0.776019 （我算的是0.79）
e）  Portfolio Return    这问老师最后的答案是0.06120   （我算的是0.026）

老师说只要结果是错的，整道题都没有分数
拜托哪位高手帮帮忙，告诉我到底要怎么算啊？用什么公式？？？？怎么带如数，肯定是我公式用错了，或者数带的不对，万分感谢啊！！！