questions 4 and 5 please

4. Suppose the interest rate on a 5 year Treasury note is 5% and the interest rate on a 5 year TIPS (inflation-indexed) is 2.5%. Using the Fisher equation, what is the average expected inflation rate over the next five years? 5. You have been given the variance of the returns on some security. You need to know the standard deviation. How can you compute it