For both questions can u pls answer in these steps to understand better

(i) Describe and interpret the assumptions related to the problem.

(ii) Apply the appropriate mathematical model to solve the problem.

(iii) Calculate the correct solution to the problem.

3. Analysts predict that over the next year, Thete, Inc.'s common stock has a 20% chance of returning 6%, a 50% chance of returning 15%, and a 30% chance of returning 24%. What is the standard deviation of returns on Thete, Inc.'s common stock? Submit your answer as a percentage and round to two decimal places. 4. Han Corporation issues a bond which has a coupon rate of 7.2%, a yield to maturity of 9.3%, a face value of $1,000, and a market price of $990. What is the semiannual interest payment? Round to two decimal places. 3. Analysts predict that over the next year, Thete, Inc.'s common stock has a 20% chance of returning 6%, a 50% chance of returning 15%, and a 30% chance of returning 24%. What is the standard deviation of returns on Thete, Inc.'s common stock? Submit your answer as a percentage and round to two decimal places. 4. Han Corporation issues a bond which has a coupon rate of 7.2%, a yield to maturity of 9.3%, a face value of $1,000, and a market price of $990. What is the semiannual interest payment? Round to two decimal places