[2 pts] The number of medications taken by all adults 65 and older has a mean of 10.8 and a standard deviation of 3.9. If a sample is taken of 225 adults 65 and older, what are the mean and standard deviation oi the sampling distribution? [2 pts] If the margin of error is exactly 8 for a 90% confidence interval for the mean, where a sample of 25 is taken from data that are normally distributed and the population variance is known, what is the standard error for the mean