According to Current Population Reports , the population distribution of number of years of education for self-employed individuals in the United States has a mean of 13.6 and a standard deviation of...

According to
Current Population Reports, the population distribution of number of years of education for self-employed individuals in the United States has a mean of 13.6 and a standard deviation of 3.0.  Find the mean and standard error of the sampling distribution of ȳ for a random sample of  9 residents.