6) Cosmic radiation levels rise with increasing altitude, promoting researchers to consider how pilots and flight crews might be affected by increased exposure to cosmic radiation. A study reported a mean annual cosmic radiation dose of 219 mrems for a sample of flight personnel of Xinjiang Airlines. Suppose this mean is based on a random sample of 100 flight crew members. Let s = 35 mrems. Calculate and interpret a 90% confidence interval for the actual mean annual cosmic radiation exposure for Xinjiang flight crew members