4. The U.S. Census Bureau announced that the median sales price of new houses sold in 2009was $215,600, and the mean sales price was $270,100. Assume that the standard deviation of the prices is $90,000. A. If you select a random sample of n=100 what is the probability that the sample mean will be less than $300,000? B. If you select a random sample of n= 100 what is the probability that the sample mean will