A survey of U.S. companies that do business with firms in India asks: approximately how many years has your company been trading with firms in India? Suppose the population is normal. If the population standard deviation was known as 9.1 years, and a random sample of 45 responses yielded a mean of 11.405 years. Please construct a 95% confidence interval for the mean number of years that a company has been trading in India for this population. What is the upper confidence interval limit? Enter your answer to 3 decimal places.

If you can show how to set this up in R, please do so. Thank you!