00:01
First, we want to calculate our covariance.
00:02
To calculate our covariance, we can use our formula.
00:06
We are going to take negative 0 .32 times 19 .45 times 2 .13.
00:15
And when we calculate this, we're going to get negative 13 .3156.
00:22
Then we need to calculate our expected return.
00:24
For portfolio a, our expected return is the average of the returns of our two investments.
00:32
So we're going to take 5 .04 plus 5 .78 and divide it by 2 to get 5 .41%.
00:41
Our standard deviation is the square root of the sum of our squares.
00:46
So our standard deviation for a is, we can use our formula, and we're going to get 9 .708.
00:56
Now we want to look at portfolio b...