Repeat Exercise 19 for samples of size 40 and 60. What happens to the mean and the standard deviation of the distribution of sample means as the sample size increases?

Data from exercise 19:

The scores for males on the critical reading portion of the SAT in 2016 are normally distributed, with a mean of 495 and a standard deviation of 120. Random samples of size 20 are drawn from this population, and the mean of each sample is determined.