The sales prices for homes in Clay County have a mean of $275,685, a median of $240,000, and a standard deviation of $135,663. A sample of 40 homes is randomly selected. (a) What is the probability that the sample mean sales price is less than $240,000? (b) What is the probability that the sample mean sales price is more than $300,000? (c) What is the probability that the sample mean sales price is between $250,000 and $280,000?