thank you 13

The average age of doctors in a certain hospital is 48.0 years old. Suppose the distribution of ages is normal and has a standard deviation of 6.0 years. If 9 doctors are chosen at random for a committee, find the probability that the average age of those doctors is less than 48.8 years. Assume that the variable is normally distributed. O 15.5% O 53.5% O 34.5% O 65.5%