A recent survey of 9 social networking sites has a mean of 13.5 million visitors for a specific month. The standard deviation was 3.2 million. Find...

A recent survey of 9 social networking sites has a mean of 13.5 million visitors for a specific month. The standard deviation was 3.2 million. Find the 98% confidence interval of the true mean. Assume the vehicle is normally distributed. round your answers to two decimal places.