3,4,5 pls

John wishes to estimate the population mean salary of college graduates who took a statistics course in college. How many college graduates must he survey? Assume that the population standard deviation is known to be $1,226, and he wants to be 90% confident that the sample mean is within $174 of the true population mean. D Question 4 2 pts Salaries of 11 college graduates who took a statistics course in college have a mean of $89,436 and a standard deviation of $1,351. Construct a 98% confidence interval for estimating the population standard deviation. Enter the upper 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 40% of the population standard deviation and to be 99% confident of that statement