The average time for a one way trip for a student to go to school is 24 minutes with a standard deviation of 8 minutes. If a sample of 40 students is selected at random, what is the probability that...

The average time for a one way trip for a student to go to school is 24 minutes with a standard deviation of 8 minutes. If a sample of 40 students is selected at random, what is the probability that the mean time to commute is faster than 20 minutes?

Question:

1. If the sample size of 40 are repeatedly taken from the population, what is the approximate value of the mean of the sample means?