Year

Return

Stock A

Stock B

Stock C

1

15%

12%

5%

2

25%

14%

-6%

3

8%

9%

10%

4

16%

25%

1%

5

5%

3%

15%

Given the data above: What is the standard deviation of returns for stock A? 

What is the variance of returns for stock B? 

What is the average return of stock C? 

What is the average return of a portfolio that has 45% invested in stock A, 35% invested in stock B and the rest invested in stock C?