(5 points) The average American woman has her first child at the age of =25. The population is normally distributed with a standard deviation of =4.5 years. Your graduating class is a sample from this population. Say your class has a size of n=50 people. What is the probability that your class has an average of between 24 and 25 for the age of motherhood? [Hint: draw a picture of the normal distribution.].