I am confused on these three questions, they are related. If you could solve them and show your work you will be a lifesaver.

1. What is the variance of returns for Packaging Corporation?

2. What is the standard deviation of returns for Packaging Corporation?

3. What is the covariance of returns between The Hershey Company and Packaging Corporation of America?

Below are the annual returns for The Hershey Company and Packaging Corporation of America for 2016 through 2019. Year The Hershey Company Packaging Corporation of America 2016 -0.123 -0.172 2017 0.187 0.390 2018 0.123 0.455 2019 -0.030 -0.287