I am confused about this stats problem

7. Suppose you have the following information on a population: p=20 52:2 median=20 a. If we wanted the standard error of the mean equal to 0.1, how large would the sample size need to be? h. Without m anhing about the shape of the distribution of this population, what is the probability that a randomly selected individual has a value of 20 or more? 0. If we took a sample of 100 from this population, roughly what is the probability that the sample mean is bigger than 25? d. Since the mean=median here, does that imply the distribution is normal? If not, sketch a distribution for which mean=median that isn't normal. e. If we assume this population is Symmetric and we created the sampling distribution of the mean for n=10, can we state it is approximately normal