Please show step by step how to find answers using Excel, thanks

Quantitative Problem: You are given the following probability distribution for CHC Enterprises: State of Economy. Probability Rate of return Strong 0.20 22% Normal 0.50 10% Weak 0.30 -5% What is the stock's expected return? Do not round intermediate calculations. Round your answer to two decimal places. 7.6 % Show All Feedback What is the stock's standard deviation? Do not round intermediate calculations. Round your answer to two decimal places. % Show All Feedback What is the stock's coefficient of variation? Do not round intermediate calculations. Round your answer to two decimal places. Show All Feedback Check M