4. Diskin et al. Studied common breath metabolites such as ammonia, acetone, isoprene, ethanol and acetaldehyde in 5 subjects over a period of 30 days. Each day, breath samples were taken and analyzed in the early morning on arrival at the laboratory. For subject \( A \), a 27 year-old female, the ammonia concentration in parts per billion (ppb) followed a normal distribution over 30 days with mean 491 and standard deviation 119. What is the probability that a random day, the subject's ammonia concentration is between 292 and 649 ppb?