Finding the probability

Consider randomly sampling from a theoretical normal distribution (and remember symmetry implications).a.  What is the probability that observations from a sample size of  will both have values above the mean? (1 pt.). b.  What is the probability that observation from a sample size of  will all have values above the mean? (1 pt.).c.  What is the probability that observations from a sample size of  will all have values above the mean? (1 pt.). 4)  How do the answers to question 3 provide insight into the fact that the standard error of a sampling distribution decreases with sample size?