need help with the following

A sample oontalning years to maturity and yield for 40 corporate bonds are oontalned in the le Corporateonds. (Round your answers to four decimal places.) Company Yearsto Company Yearsto Ticker Maturity Ticker Maturity (a) What Is the sample mean years to maturlty for corporate bonds and what is the sample standard deyiatlon? (b) Develop a 95% confidence interval for the population mean years to maturity. :lwtoclw (c) What Is the sample mean yield on corporate bonds and what is the sample standard devlation? E = [:1 % s = [:1 % (cl) Develop a 95% confidence interval for the population mean yield on corporate bonds. :l%m:]%