A research scientist wants to know how many times per hour a

A research scientist wants to know how many times per hour a certain strand of bacteria reproduces. The mean is found to be 12.4 reproductions and the population standard deviation is know to be 1.9. If a sample of 955 was used for the study, construct the 99% confidence interval for the true mean number of reproductions per hour for the bacteria. Round your answers to one decimal place.

the 99% confidence interval is (12.2416, 12.5584)