The union for a particular industry has determined that the standard deviation of the daily wages of its workers is $15. A random sample of 150 workers in this industry has a mean daily wage of $123. Find a 99% confidence interval for the true mean daily wage of all union workers in the industry. Then give its lower limit and upper limit. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit: X . ? Upper limit