I need help with these two

D Question 4 ments 2 pts Salaries of 11 college graduates who took a statistics course in college have a mean of $85,337 and a standard deviation of $1,131. Construct a 90% confidence interval for estimating the population standard deviation. Enter the lower bound of the confidence interval. (Round your answer to nearest whole dollar.) D Question 5 2 pts John wishes to estimate the population standard deviation of salary of college graduates who took a statistics course in college. How many college graduates must he survey? Assume that he wants to be the sample standard deviation to be within 10% of the population standard deviation and to be 99% confident of that statement